Initiative

今天终于把思科网院的折扣号考试做完了，还是老办法，Ctrl+C, Ctrl+F，几下就搞定了。搜集了不少资料，放在这里备用。

首先是TestKing的超级题库，是一个1.3MB的pdf

下面是我自己做的2套题，手工转换成txt贴出来，正确率85%以上。第一套是网上搜集的答案，第四套是从一个 .doc 的文档中转换过来的。

1 Which command will display statistics for all interfaces configured on a router?
list interfaces
show interfaces√
show processes
show statistics

2 Which of the following are functions of a WAN? (Choose three.)
permit real-time communication between users√
allow users access to high bandwidth
provide full-time local service
provide e-mail and e-commerce services√
connect physically adjacent devices
provide access to computers in other locations√

3 Which statements about VLANs are true? (Choose three.)
VLANs are restricted to a physical segment.
They are logical groupings of devices.√
User hosts can be grouped by function.√
VLANs are configured by software. √
VLANs are standardized.

4 Which device allows data communication to occur between VLANs?
bridge
hub
switch
router√

5 What determines how much data a sending station running TCP/IP can transmit before it must receive an acknowledgment?
segment size
transmission rate
bandwidth
window size √
sequence number

6 What is the length, in bits, of an Ethernet address?
12
24
32
48√
80
128

7 Which layer is responsible for organizing bits using framing?
Layer 1
Layer 2√
Layer 3
Layer 4

8 Which of the following messages are sent From a DHCP server to a client during a successful configuration process? (Choose two.)
DHCPDISCOVER
DHCPOFFER√
DHCPREQUEST
DHCPACK √

9 What are the effects of LAN segmentation using a switch? (Choose three.)
dedicated bandwidth between source and destinations√
enlarged collision domains
decreased broadcast domains
increased number of collision domains√
increased latency in the network √

10 The switches in the graphic are configured for VTP as shown. Select the statements that correctly describe the operation of these switches. (Choose two.)
A new VLAN can be added to Switch1 and that information will be added only to Switch2.
An existing VLAN can be deleted From Switch2 and that VLAN will be deleted From Switch1 and Switch4.
A new VLAN can be added to Switch4 and that information will be added to Switch1, Switch2, and Switch3.
A new VLAN can be added to Switch1 and that information will be added to Switch2 and Switch4.√
A new VLAN can be added to Switch3 and that information will be added to Switch1, Switch2, and Switch4.
An existing VLAN can be deleted From Switch4 and that VLAN will be deleted From Switch1 and Switch2.√

11 What does the ISDN BRI provide?
23 B channels and one kbps D channel
total bit rate up to 1.536 Mbps
two 56 kbps B channels and one kbps D channel
two kbps B channels and one 16 kbps D channel√

12 Which statement is correct concerning routing and routed protocols?
A routed protocol allows the routers to communicate with other routers and maintain tables for a routing protocol.√
A routing protocol allows routers to communicate with other routers and maintain tables for a routed protocol.
Routers only need to use routing protocols to work properly.
There is no difference between routed and routing protocols.

13 Which utility can be used to verify connectivity through all seven layers of the OSI model?
netstat
ping
Telnet√
traceroute

14 What is the purpose of the IOS "enable secret" command?
to set password protection on incoming Telnet sessions
to set password protection on the console terminal
to allow a user access to User mode
to allow a user to enter a password that will be encrypted √

15 If the above network has been configured with RIPv2, how many usable host addresses are in the 192.168.10.192/30 subnet?
0
2√
4
6
8

16 Which address does a bridge use to build its bridging table?
destination IP address
destination MAC address√
source IP address
source MAC address

17 Which statement describes the store and forward transmission mode of an Ethernet switch?
It is also referred to as a hybrid mode or as error sensing mode.
It requires the switch to read the first bytes of an Ethernet frame and then begins to forward the data.
It decreases the latency of the transmission but has very little error detection.
It increases latency with large frames, but error detection is high.√

18 What enables routers to learn of destination networks?
proxy ARP
CAM table exchanges
host name tables
routing protocols√
DNS lookups

19 By default, which of the following metrics is given the most weight by IGRP?
bandwidth√
hop count
load
reliability

20 Which method does a router use to build a Frame Relay map?
ARP requests
RARP requests
Inverse RARP requests
Inverse ARP requests√

21 Which of the following represents a group of routers under a common admin istration and is required when configuring routing protocols such as IGRP or EIGRP?
control group
autonomous system√
corporate system
Domain Name System
local-area network
wide-area network

22 Identify the correct pairing of a protocol and its classification.
BGP-Interior
IGRP-Exterior
OSPF-Exterior
RIP-Interior√

23 Which statements describe the use of Link State Advertisements (LSA)? (Choose two.)
LSAs are generated when changes in the network occur.√
Link state advertisements are refreshed every 60 minutes.
The router copies the information received From each LSA packet into the routing table.
Routers exchange LSAs to build and maintain topology databases. √
Forwarding LSAs can increase the occurrence of routing loops.

24 Routers and switches both perform important tasks in an internetwork. Which of the following are distinguishing differences between them? (Choose two .)
Routers are used more than switches.
Routers need no configuration to operate.
Routers and switches operate at different layers of the OSI model.√
Routers and switches route different sets of protocols.
Routers block broadcasts.√
Switches create broadcast domains.

25 Which of the following do switches send at regular intervals to eliminate switching loops?
bi-directional protocol data units
binary protocol data units
bridge protocol data units(BPDU)√
buffered protocol data units

26 Which of the following IP addresses are broadcast addresses if the subnet mask is 255.255.255.240? (Choose three.)
75.32.75.15√
205.16.35.11
199.254.129.111√
129.130.17.143√
135.22.55.93
105.33.62.213

27 For which condition will the ARP protocol be used?
The destination IP address is unknown.
The destination MAC address is unknown.√
The source IP address is unknown.
The source MAC address is unknown.

28 Which of the following is true regarding latency?
CSMA/CD requires no latency.
It is also called asymmetry.
It is based entirely on distance.
Networking devices add to latency.√

29 The Cake router shown in the graphic has multiple RIP version 2 (hop courters)paths to the network attached to E0 of the Pie router. Which interface on the Cake router will be used to forward a packet From the 192.168.5.0 network to the 192.168.13.0 network?
E0
E1√
S0
S1
It will load balance across S0 and S1.
It will load balance across S0, S1 and E1.

30 What is required to configure multiple DLCIs on a single router interface ?
A single network address
Multiple LMIs
Subinterfaces√
Multiple IP addresses on the same subnet

31 When must data be sent by way of the default route?
The destination network is on a different network than the source.
The destination network is not directly connected to the router.
The destination network is a stub network.
There is no entry in the routing table for the destination network.√

32 Which of the following EIGRP functions is the responsibility of the IP protocol-dependent module (PDM)? (Choose three.)
the calculation of successor and feasible successor routes for IP and IPX traffic
the notification of DUAL when IP routing information is received√
the communication of information about IP routes with neighbor routers
the maintenance of the IP routing table
the exchange of hello packets with other IP-enabled routers√
the insertion of lowest cost paths into the routing table√

33 Which reason is correct for having at least one true condition in an ACL?

If there is not a true statement, all packets are returned to the sender.
The implicit "deny any" statement will deny all traffic.√
True conditions only test the status of the router.
You are not required to have a true statement in ACL.

34 Company XYZ has a Class B address of 135.166.0.0 and currently has 4 individual segments to subnet. The company will be adding 5 additional segments over this year and 7 additional networks the following year. What subnet mask should be used on the network in order to support the largest number of hosts per subnet?
255.255.224.0
255.255.240.0
255.255.248.0 √
255.255.250.0
255.255.252.0

35 Given a router that has already been configured, what is the correct loading sequence when powering on?
bootstrap, RAM, operating system
bootstrap, configuration file, operating system
bootstrap, operating system, configuration file√
operating system, configuration file, RAM

36 What is an advantage of the use of layers in the OSI reference model?
It breaks network communications into larger parts.
It increases complexity.
It prevents changes in one layer From affecting other layers.√
It requires the use of single-vendor equipment for hardware and software communications.

37 Which of the following is true regarding routing metrics?
All routing protocols use the same metrics.
IGRP uses bandwidth as its only metric.
Routers compare metrics to determine the best route.√
The larger metric generally represents the better path.

38 Which of the following are routed protocols?
AppleTalk, IP, IGRP
IP, IPX ,AppleTalk√
IP, RIP, IPX
IPX, OSPF, EIGRP

39 Which networking device performs path determination?
a hub
a switch
a router√
a bridge

40 Which type of ACL only checks the source address?
Extended ACL
General ACL
Source ACL
Standard ACL√

41 What is the default ISDN encapsulation used on Cisco ISDN routers?
SLIP
PPP
HDLC√
VPP

42 Which of the following improves security in PPP authentication?
LCP
NCP
CHAP√
PAP

43 What is the function of the first phase of PPP negotiation?
link termination
authentication of communicating peers
link establishment and configuration√
network layer protocol configuration

44 What is the purpose of the show CDP neighbors command?
to send a summary of the local router configuration to all directly attached Cisco devices
to display information about all Cisco devices that are directly connected to a local router√
to display information about all Cisco networks in the WAN
to display addressing information about all remote routers
to display the names of all OSPF neighbors in the local area

45 What reduces the problems of routing loops due to incorrect updates?
count to infinity
distance vector timers
event-triggered updates
split horizon√

46 All the routers in the network shown in the graphic are part of the same OSPF area. All the routers were powered up simultaneously, except Router E, which was brought online the following day. Which router will be the BDR after the network has converged?
Router A
Router B
Router C
Router D
Router E√

47 Which functions are carried out by switches and bridges when building the CAM tables? (Choose three.)
builds the table using unknown source MAC addresses From received frames
builds the table using unknown destination MAC addresses From received frames
time stamps the entries for each address√
time stamps the BPDU of each frame received√
maps switch port numbers with the associated MAC address√
maps switch port numbers with the associated network address

48 Which type of handshaking occurs when using CHAP?
one-way
two-way
three-way√
four-way

49 Which component designates a device that is not compatible with ISDN and requires a terminal adapter?
NT1
NT2
TE1
TE2 √

50 How is the number 225 represented in binary?
11001111
11011011
11110011
11100001√

51 How many bits are in IPv6 addresses?
16
32

96
128√
258

52 An administrator has an older 1900 switch located on the edge of the network. What can the network administrator do to ensure that it does not become the root bridge of the spanning-tree network?
decrease the BPDU hello timer update on the 1900
assign the highest IP address to the switch that should be the root
assign the lowest IP address to new root bridge
assign the lowest priority to the switch that should be the root√
assign the highest priority to the new root bridge
decrease the BID on the 1900 switch

53 Refer to the graphic. Which of the following are true regarding the route summary EIGRP would utilize for the networks on RouterA? (Choosetwo.)

The networks can be summarized with auto-summary.
The network summary must be manually configured.√
The default subnet mask can be used to summarize the networks.
The networks can be summarized with 172.16..0/26.
The networks can be summarized with 172.16..0/27.√
The networks can be summarized with 172.16..0/28.

54 What is true about windowing?
It always requires separate acknowledgements for each segment sent.
It controls the amount of data that can be sent before acknowledgement is required.√
It requires the sender to re-establish a connection if no acknowledgement is received.
It allows TCP/IP to measure transmitted data in segments.

55 What is the name of that point in a LAN Where the responsibility of the network administrator ends and the responsibility of the telco begins?
point of presence
local loop
DTE
demarcation√

56 Which of the following are benefits of creating a subnetwork structure in an IP network? (Choose three.)
permits network address duplication
allows for address flexibility√
prevents address replication√
provides broadcast containment
adds low-level security √
allows for more network hosts available

57 Which methods do frame relay switches use to inform DTEs of congestion within the frame relay network?
CCP and LMI
CIR and LATE
DLCI and SPID
FECN and BECN√

58 What transmission channels are provided by an ISDN BRI service?
23 kbps B channels and one kbps D channel
30 kbps B channels and one 16 kbps D channel
two 56 kbps B channels and one 16 kbps D channel
two kbps B channels and one 16 kbps D channel√
two kbps D channels and one 16 kbps B channel
23 kbps D channels and one kbps B channel

59 What is the term for the cabling that connects the customer premises equipment to the CO switch?
demarc
local loop
final mile
DTE√
trunk line

60 Which of the following is the ISDN Layer 2 signaling protocol?
BRI
PRI
LAPA
LAPD√
47\56\32\36

1
What can be created by borrowing bits From the host portion of an IP address?

extended IP addresses

additional IP addresses

segments

Subnetworks √

smaller collision domains

2
Which type of protocol is used between routers to communicate and maintain tables?

non-routable

Routable

Routed √

Routing

3
What are the effects of LAN segmentation using a switch? (Choose three.)

dedicated bandwidth between source and destinations √

enlarged collision domains

decreased broadcast domains

increased number of collision domains √

increased latency in the network √

4
What is the default ISDN encapsulation used on Cisco ISDN routers?

SLIP

PPP

HDLC √

VPP

5
When connecting two routers From different vendors using a dedicated point-to-point connection, which type of encapsulation should be used?

Cisco

HDLC

IETF

PPP √

6
Which statements describe the operation of VLANs? (Choose two.)

All switch ports assigned to a VLAN are part of the same collision domain.

All switch ports assigned to a VLAN are part of the same broadcast domain. √

Using VLANs to logically organize workgroups minimizes latency in the network.

Members can be assigned to VLANs based on port ID, MAC address, or protocol.

Multiple VLANs can be assigned to a single, Layer 3 network address and routers can be used to route traffic between VLANs√.

7
Which of the following authentication processes provides protection against playback attacks?

CHAP √

DDI

PAP

TCP

8
Given a router that has already been configured, what is the correct loading sequence when powering on?

bootstrap, RAM, operating system

bootstrap, configuration file, operating system

bootstrap, operating system, configuration file √

operating system, configuration file, RAM

9
The ISDN, Frame Relay, and HDLC encapsulations are defined at which layer of the OSI model?

network

session

data link √

transport

physical

10
Which utility shows the route a packet takes to reach its destination?

netstat

ping

Telnet

Traceroute √

11
A company with five locations, each requiring a single subnet with 75 IP addresses, was assigned two consecutive Class C addresses. Which routing protocols will support this addressing scheme? (Choose three.)

RIPv1

RIPv2 √

IGRP

OSPF √

EIGRP √

TFTP

12

The switches in the graphic are configured for VTP as shown. Select the statements that correctly describe the operation of these switches. (Choose two.)

A new VLAN can be added to Switch1 and that information will be added only to Switch2.

An existing VLAN can be deleted From Switch2 and that VLAN will be deleted From Switch1 and Switch4.

A new VLAN can be added to Switch4 and that information will be added to Switch1, Switch2, and Switch3.

A new VLAN can be added to Switch1 and that information will be added to Switch2 and Switch4. √

A new VLAN can be added to Switch3 and that information will be added to Switch1, Switch2, and Switch4.

An existing VLAN can be deleted From Switch4 and that VLAN will be deleted From Switch1 and Switch2. √

13
What is the purpose of the show CDP neighbors command?

to send a summary of the local router configuration to all directly attached Cisco devices

to display information about all Cisco devices that are directly connected to a local router √

to display information about all Cisco networks in the WAN

to display addressing information about all remote routers

to display the names of all OSPF neighbors in the local area

14
Which of the following describe the Spanning Tree Protocol? (Choose two.)

It prevents routing loops.

It prevents broadcasts in a switched network.

It operates at Layer 3.

It uses BPDUs to select the shortest path in a switched network. √

It allows a router to load balance across redundant links.

It prevents switching loops. √

15

What are the advantages of OSPF in comparison with RIP v2? (Choose two.)

OSPF provides support for Classless Interdomain Routing but RIP v2 does not.

OSPF may result in faster convergence, due to triggered updates. √

OSPF's built-in features make it easy to design, implement, and troubleshoot.

OSPF routers build a complete view of the network, reducing the potential for routing loops. √

OSPF sends periodic link state advertisements to keep the link active.

OSPF routers have lower memory and processor requirements.

16

Which connection modes are supported on a Frame Relay subinterface? (Choose two.)

Dynamic

Multicast

Multipoint √

multipoint-to-point

point-to-point √

Static

17
What are the functions of a Layer 2 Ethernet switch? (Choose three.)

preventing broadcasts

increasing available bandwidth per user√

decreasing the size of collision domains√

isolating traffic among segments√

routing traffic between different networks

decreasing the number of broadcast domains

18

Which router parameters can be set From global configuration mode? (Choose two.)

IP address

Telnet password

hostname√

console password

subnet mask

enable secret password√

19

Which of the following are types of EIGRP packets? (Choose three.)

hello√

respond

DUAL

Query √

Acknowledgement √

holddown

20

Which of the following is the reference point between the NT1 and the phone company network?

R

S

T

U√

21

Within a Frame Relay network, which methods are used by switches to inform DTEs of congestion?

CCP and LMI

CIR and LATE

DLCI and SPID

FECN and BECN√

22

What is another term for latency?

backoff algorithm

hold-down timer

propagation delay√

redundancy

23

Which representations have the same meaning when representing the subnet mask?

/10 and 255.224.0.0

/15 and 255.255.0.0

/21 and 255.255.248.0√

/24 and 255.255.0.0

24

What is the command syntax used to create a subinterface?

Router(config-if)# int s0.115 point-to-point √

Router(config-if)# int s0 subinterface 115 point-to-point

Router(config-if)# subinterface 115 point-to-point

Router(config-if)# subinterface s0.115 point-to-point

25
Which command will display the Cisco IOS currently running on a router?

show ip interfaces

show ip route

show cdp nei detail

show version√

show flash

26
For the purpose of forwarding packets, which protocol manages communication between routers regarding available routes ?

DNS

ICMP

RIP√

ARP

CDP

STP

27
Which command displays the active configuration of a router?

Router# show flash

Router# show configuration

Router# show running-config √

Router# show startup-config

28

Which statements are true regarding the network configuration in the accompanying graphic? (Choose three.)

The EIGRP PID is 101.

The EIGRP AS is 101. √

Traffic is not going to be routed between networks configured with different routing protocols.√

IGRP 24-bit metrics will be changed to EIGRP metrics by EIGRP routers.

The command router eigrp 101 enables the EIGRP routing process.√

Network 192.168.1.0 is part of EIGRP AS 101.

29
Which statement describes dynamic routing correctly?

Dynamic routing automatically adjusts for topology or traffic changes.√

Dynamic routing must always be used to reach a stub network.

Dynamic routing uses route information entered by an administrator.

Dynamic routing reveals everything known about an entire autonomous system.

30
How many host addresses may be assigned on each subnetwork when using the 130.68.0.0 network address with a subnet mask of 255.255.248.0?

30

256

2046√

2048

4094

4096
窗体底部

31
Which IGRP metrics are used by default? (Choose two.)

bandwidth√

load

reliability

maximum transmission unit

delay√

network control

32
Which mode will a router enter if it is unable to locate a valid startup configuration file during the boot process?

boot mode

config mode

RXBOOT mode

ROM monitor mode

setup mode√

turnkey mode

33
What enables routers to learn of destination networks?

proxy ARP

CAM table exchanges

host name tables

routing protocols√

DNS lookups

34
Which automatic process is started first whenever power is applied to a Cisco router?

empties contents of NVRAM

looks for the configuration file

performs a POST√

starts the operating system

35
An ISDN BRI line can be described as which of the following?

2B + D√

2D + B

23B + D

23D + B

36

Which commands will configure the router ports with IP addresses as shown in the diagram? (Choose three.)

R1(config)# interface s0
R1(config-if)# ip address 10.1.1.146 255.255.255.252√

R1(config)# interface e0
R1(config-if)# ip address 10.1.7.255.255.252.0√

R1(config)# interface s0
R1(config-if)# ip address 10.1.1.147 255.255.255.0

R1(config)# interface e0
R1(config-if)# ip address 10.1.4.0 255.255.252.0

R2(config)# interface e0
R2(config-if)# ip address 10.1.16.1 255.255.255.0

R2(config)# interface e0
R2(config-if)# ip address 10.1.31.255.255.240.0√

37
Which of the following are commonly used routing metrics? (Choose three.)

ARP

hop count √

window size

Delay √

Load √

media type

38
Which LMI types are available with Cisco routers?

ANSI, Cisco, HDLC

ANSI, Cisco, q933a√

ANSI, Cisco, DLCI

Cisco, IETF, q933a

39
How are VLANs configured?

by moving switches to different router ports

by changing switchports for each host on the segment

by physically moving equipment to a different network

through software√

through hardware

automatically with a plug and play module

40
Which Layer 4 protocol is connection-oriented and reliable?

ICMP

TCP√

TFTP

UDP

HTTP

41
Which of the following commands sets a condition to allow packets through a named ACL?

Adjust

Apply

Control

Permit √
42
Which statement is correct concerning routing and routed protocols?

A routed protocol allows the routers to communicate with other routers and maintain tables for a routing protocol. √

A routing protocol allows routers to communicate with other routers and maintain tables for a routed protocol.

Routers only need to use routing protocols to work properly.

There is no difference between routed and routing protocols.
43
Which OSI model layer is responsible for regulating the flow of information From source to destination, reliably and accurately?

application

presentation

session

Transport √

network

44
Which packet-switched WAN technologies are characterized by the use of Permanent Virtual Circuits (PVCs)?

Frame Relay and ISDN

Frame Relay and X.25√

ISDN and X.25

ISDN only

45
Which device uses logical addresses to interconnect networks or subnetworks?

hub

switch

Router √

bridge

repeater
46
How is RIP configured on a router?

RIP is configured globally and then assigned an IP address and subnet mask.

RIP is configured globally and then applied to each interface that will participate in the RIP routing process.

RIP is configured individually on each interface that will participate in the RIP routing process.

RIP is enabled globally and then networks are associated with the RIP routing process. √

47
Which layer of the OSI model provides negotiation of data transfer syntax?

application

Presentation √

session

transport

network
48
All routers shown in the graphic are part of the same OSPF area. Which routers will PERTH engage in DR and BDR elections? (Choose three.)

LONDON

PALMER√

PERTH √

FRANKLIN√
49
Refer to the graphic. This company was assigned a Class C network address for its two sites. The network administrator subnetted accordingly and configured each router with RIP. However, these routers are unable to connect to each other. What could be the problem?

RIP cannot be used in place of a static route.

RIPv1 was configured instead of RIPv2. √

RIPv2 was configured instead of RIPv1.

RIP does not support stub networks.
50
Which device allows data communication to occur between VLANs?

bridge

hub

switch

Router √
51
Which ISDN channel is used for call setup?

B

D √

X

SS-7

PRI

BRI
52
Which item best describes the ping command?

It uses ICMP echo packets to verify connectivity at the TCP/IP internet layer. √

It checks for connectivity at the TCP/IP application layer.

It uses Time to Live (TTL) values to generate messages From each router used along a path.

It verifies sliding window settings at the TCP/IP transport layer.
53
What are two authentication options supported by PPP? (Choose two.)

clear text

PAP√

CHAP√

LCP

SLIP
54
What is the length of a MAC address?

12 bits

24 bits

38 bits

48 bits√
55
Which device connects four-wire ISDN subscriber wiring to the conventional two-wire local loop?

NT1 √

NT2

TE1

TE2
56
How is the number 225 represented in binary?

11001111

11011011

11110011

11100001√
57
What is used to resolve known IP addresses to unknown MAC addresses?

ARP√

DNS

DHCP

RARP

58
In reference to the TCP/IP model, which protocol is used to determine the network access layer address associated with a known Internet layer address?

ARP√

ICMP

IP

RARP

TCP

UDP
59
Which address does a bridge use to build its bridging table?

destination IP address

destination MAC address√

source IP address

source MAC address
60
Which command will successfully configure a router to use PPP encapsulation on one of its links?

router> encapsulation ppp

router# encapsulation ppp

router(config)# encapsulation ppp

router(config-if)# encapsulation ppp√
6\19\26\30\47

1 Which type of encapsulation is recommended to be used to connect two routers From different vendors through a dedicated point-to-point connection?
CIR
FCS
ANSI
PPP√
HDLC
2 How is RIP configured on a router?
RIP is configured globally and then assigned an IP address and subnet mask.
RIP is configured globally and then applied to each interface that will participate in the RIP routing process.
RIP is configured individually on each interface that will participate in the RIP routing process.
RIP is enabled globally and then networks are associated with the RIP routing process. √
3 An administrator has an older 1900 switch located on the edge of the network. What can the network administrator do to ensure that it does not become the root bridge of the spanning-tree network?
decrease the BPDU hello timer update on the 1900
assign the highest IP address to the switch that should be the root
assign the lowest IP address to new root bridge
assign the lowest priority to the switch that should be the root√
assign the highest priority to the new root bridge
decrease the BID on the 1900 switch
4 Which utility shows the route a packet takes to reach its destination?
netstat
ping
Telnet
traceroute√
5 Which configuration parameters can a host receive From a DHCP server? (Choose three.)
MAC address
outside global address
DNS server address√
DHCP helper address
default gateway address√
IP address/subnet mask√
>>>>>>>>6 The network in the graphic is using EIGRP with the metrics shown. Router A has a route to network 210.67.130.0 through Router C, with a feasible distance of three. What will happen if the direct link between A and C becomes unavailable? (Choose two.)
DUAL will immediately promote the feasible successor route through Router B to successor route status.
The route to Network C on Router A will be placed in Active status. √
The route to Network C on Router A will be placed in Passive status.
Router A will send query packets to all neighbor routers. √
Router A will mark the link as down until regularly scheduled update packets are received.
7 In an IPv4 environment, what information is used by the router to forward data packets From one interface of a router to another?
destination network address √
source network address
destination MAC address
source MAC address
well known port destination address
well known port source address
8 What operations can be executed From the Router> prompt? (Choose two.)
enter privileged mode with the enable command√
modify passwords
modify the router name with the hostname command
view basic router status√
view passwords
view the running-configuration with the show running-config command
9 Which automatic process is started first whenever power is applied to a Cisco router?
empties contents of NVRAM
looks for the configuration file
performs a POST√
starts the operating system
10 Host A in the graphic has received its DHCP configuration From R1. Host A is unable to reach the Internet. What could cause this problem?
The DNS server is not on the same LAN as Host A.
The ip helper-address command must be configured on the Ethernet interface.
Host A did not receive the correct gateway address. √
The DHCP service has not been enabled on interface e0.
The router IP address has been excluded From the DHCP pool.
The subnet mask in the network command is incorrect.
11 Which layer of the OSI model can provide connection-oriented and reliable data transfer between two hosts?
application
presentation
session
transport √
12 How many host addresses may be assigned on each subnetwork when using the 130.68.0.0 network address with a subnet mask of 255.255.248.0?
30
256
2046√
2048
4094
4096
13 What is the length of a MAC address?
12 bits
24 bits
38 bits
48 bits√
14 Which of the following represents a group of routers under a common administration and is required when configuring routing protocols such as IGRP or EIGRP?
control group
autonomous system√
corporate system
Domain Name System
local-area network
wide-area network
15 Which protocol of the TCP/IP model internet layer provides connectionless, best-effort-delivery of datagrams?
ARP
ICMP
IP√
RARP
TCP
DNS
16 What is the correct order of the layers of the OSI reference model, starting at the lowest layer and working up the model?
data link, physical, transport, network, presentation, session, application
physical, data link, network, session, transport, presentation, application
physical, data link, network, transport, presentation, session, application
physical, data link, network, transport, session, presentation, application√
application, session, presentation, transport, data link, network, physical
17 Given the Class B network address of 130.68.0.0 and the graphic, what subnet mask should be assigned to insure the maximum number of host addresses are available for use on each subnetwork?
255.255.224.0√
255.255.240.0
255.255.248.0
255.255.252.0
255.255.255.224
255.255.255.240
18 Which device imposes boundaries on broadcast traffic?
bridge
repeater
router √
transceiver
19 How are VLANs configured?
by moving switches to different router ports
by changing switchports for each host on the segment
by physically moving equipment to a different network
through software√
through hardware
automatically with a plug and play module
20 What is required to configure multiple DLCIs on a single router interface?
a single network address
multiple LMIs
subinterfaces √
multiple IP addresses on the same subnet
21 Which command will display statistics for all interfaces configured on a router?
list interfaces
show interfaces√
show processes
show statistics
22 A static route needs to be configured to network 192.17.10.0/24. This route should have an administrative distance of 180. Which command will configure this route if the IP address of the next hop interface is 10.15.0.1?
Router(config)# ip route 192.17.10.1 255.255.255.0 10.15.0.0 180
Router(config)# ip route 192.17.10.0 255.255.255.0 10.15.0.1 180√
Router(config)# ip route 10.15.0.1 192.17.10.0 255.255.255.0 180
Router (config)# ip static-route 192.17.10.0 255.255.255.255 10.15.0.1 180
Router (config)# ip default-route 192.17.10.0 255.255.255.255 10.15.0.1 180
23 Which command displays the active configuration of a router?
Router# show flash
Router# show configuration
Router# show running-config√
Router# show startup-config

24 Which ISDN channels are used for voice, video, and data?
A channels
B channels√
E channels
D channels
Q channels
E channels
25 Which of the following are characteristics of RIPv2? (Choose two.)
requires classful addressing for configured interfaces
forwards routing updates using multicasts
forwards routing updates using broadcasts√
operates as a hybrid routing protocol
supports variable-length subnet masking√
26 A network administrator wants to reconfigure a router. Which of the following will clear the running-configuration in preparation for the reconfiguration?
erase running-config and then reload
erase running-config
reload
no running-config and then reload
erase startup-config and then reload√
delete running-config
27 What are the two basic functions that a router uses to relay packets?
filtering and switching
path determination and filtering
path determination and switching√
traffic analysis and filtering
28 Which layer of the OSI model establishes, manages, and terminates sessions between applications?
Layer 7
Layer 6
Layer 5√
Layer 4
Layer 3
Layer 2
29 Which utility can be used to verify connectivity through all seven layers of the OSI model?
netstat
ping
Telnet√
traceroute
30 Which of the following describes the CIR in a Frame Relay network?
guaranteed data rate that the service provider commits to providing√
maximum data burst rate that the switch can handle
number of simultaneous virtual circuits available From a service provider
number of simultaneous DLCIs that can be established across the cloud
31 What is another term for latency?
backoff algorithm
hold-down timer
propagation delay√
redundancy
32 Which command will verify that a router is configured with RIPv2 and that the hold-down timer and administrative distance are set to the default values?
show ip route
show interface brief
show ip protocols√
show interface
33 Identify the correct pairing of protocols and their classifications.
Routed - IP, IGRP
Routed - RIP, OSPF
Routing - IPX, RIP
Routing - OSPF, IGRP√
34 What are the advantages of OSPF in comparison with RIP v2? (Choose two.)***
OSPF provides support for Classless Interdomain Routing but RIP v2 does not.
OSPF may result in faster convergence, due to triggered updates. √
OSPF's built-in features make it easy to design, implement, and troubleshoot.
OSPF routers build a complete view of the network, reducing the potential for routing loops. √
OSPF sends periodic link state advertisements to keep the link active.
OSPF routers have lower memory and processor requirements.
35 When a user generates information to be sent on a network, in what order does data encapsulation occur?
data, frame, segment, packet, bits
data, packet, frame, segment, bits
data, packet, segment, frame, bits
data, segment, packet, frame, bits√
36 A packet destined for 10.188.12.12 is received by a router with the configuration shown in the graphic. The routing table displays the following lines: 10.0.0.0/24 is subnetted, 3 subnetsR 10.5.5.0 [120/1] via 10.20.20.2, 00:00:18, Serial0/0C 10.20.20.0 is directly connected, Serial0/0C 10.10.10.0 is directly connected, FastEthernet0/0What will happen?
The packet will be forwarded to the next hop.
The router will forward the packet out all ports.
The packet will be dropped. √
The router will forward the packet out all ports except the receiving port.
>>>>>>>>37 The administrator of the network shown in the graphic would like to use VLSM to subnet the company's Class C address. Which subnet masks should be used on the LANs and serial links to waste the fewest host addresses? (Choose three.)
255.255.255.0
255.255.255.192√
255.255.255.224
255.255.255.240√
255.255.255.248
255.255.255.252√
38 Which protocols or applications allow a network administrator to monitor a network? (Choose three.) ***
FTP
SNMP√
RMON√
syslog√
DHCP
SMTP
39 What is the term for the cabling that connects the customer premises equipment to the CO switch?
Demark
local loop
final mile
DTE√
trunk line

40 What are the primary functions of a Layer 2 Ethernet switch? (Choose three.)
filters traffic between LAN segments
achieves greater bandwidth per user√
prevents hosts From sending broadcasts
increases the number of broadcast domains through VLANs√
decreases the number of collision domains through VLANs√
41 Which of the following is an alternative to a dedicated WAN link?
X.25
ISDN√
T1
DS3
42 A ping 192.1.1.20 command is issued on workstation A to determine if workstation B can be reached. What events will occur if this command is successful? (Choose two.)
The router will block the ping request message.
The router will reply to the echo request with a proxy ping response.
Workstation A will send a UDP ping request message to workstation B.
Workstation B will send a UDP ping reply message to workstation A.
Workstation A will send an ICMP echo request message to workstation B. √
Workstation B will send an ICMP echo reply message to workstation A. √
43 Which packet-switched WAN technologies are characterized by the use of Permanent Virtual Circuits (PVCs)?
Frame Relay and ISDN
Frame Relay and X.25√
ISDN and X.25
ISDN only
44 Which item is a commonly used metric?
ARP
Hop Count√
Acknowledgment Number
Time
45 Which statement best describes the difference between exterior routing protocols and interior routing protocols?
Exterior routing protocols are used for communications within a single autonomous system, and interior routing protocols are used for communications between autonomous systems.
Interior routing protocols are used between neighbor routers, and exterior routing protocols are used between peer routers.
Interior routing protocols are used by mid size companies, and exterior routing protocols are used by large organizations.
Interior routing protocols are used for communications within a single autonomous system, and exterior routing protocols are used for communications between autonomous systems. √
46 Which of the following will successfully delete an access list?
Router# no access-list list-number
Router(config)# no access-list list-number√
Router(config-if)# no access-list list-number
Router(config-router)# no access-list list-number
47 What command is used to verify that a Frame Relay link is up and operational?
Router# show line
Router# show version
Router# show interface√
Router# show frame-relay
Router# show frame-relay status
48 Which statements reflect the process of common LAN protocols accessing the media? (Choose three.) ***
Ethernet is a non-deterministic protocol that allows the first node that accesses the medium to transmit its data.
Token Ring is a deterministic protocol that allows only one node within the ring a turn to transmit data before passing control to the next node. √
Token Ring is a non-deterministic protocol that uses a first-come, first-serve approach for nodes to seize the token and transmit data.
FDDI networks use a deterministic approach to assure that each node has fair access to the medium. √
Ethernet and Token Ring networks avoid collisions by allowing only one node to transmit at a time.
Ethernet is a deterministic protocol that uses CSMA/CD to assure that each node takes turns to access the medium. √
49 Which ISDN channel is used for call setup?
B
D√
X
SS-7
PRI
BRI

=====================不一定对=====================

1 What is the term for the cabling that connects the customer premises equipment to the CO switch?

demarc
*local loop
final mile
DTE
trunk line

2 A network administrator wants to reconfigure a router. Which of the following will clear the running-configuration in preparation for the reconfiguration?

erase running-config and then reload
erase running-config
reload
no running-config and then reload
*erase startup-config and then reload
delete running-config

3 A ping 192.1.1.20 command is issued on workstation A to determine if workstation B can be reached. What events will occur if this command is successful? (Choose two.)

The router will block the ping request message.
The router will reply to the echo request with a proxy ping response.
Workstation A will send a UDP ping request message to workstation B.
Workstation B will send a UDP ping reply message to workstation A.
*Workstation A will send an ICMP echo request message to workstation B.
*Workstation B will send an ICMP echo reply message to workstation A.

4 How is spanning-tree path cost determined by default?

total hop count
*sum of the costs based on bandwidth
dynamically determined based on load
individual link cost based on latency

5 Which of the following statements describes the operation of routing with EIGRP? (Choose three.)

*As new neighbors are discovered, entries are placed in a neighbor table.
If the feasible successor has a higher advertised cost than the current successor route, then it becomes the primary route.
*If hello packets are not received within the hold time, DUAL must recalculate the topology.
*The reported distance is the distance to a destination as advertised by a neighbor.
Routes learned through IGRP are identified as internal routes.
EIGRP builds one routing table that contains routes for all configured routed protocols.

6 What are the two basic functions that a router uses to relay packets?

filtering and switching
path determination and filtering
*path determination and switching
traffic analysis and filtering

7 A partial configuration of a Catalyst 1900 switch is shown in the graphic. Why do the following commands fail to delete VLAN1 and VLAN2? (Choose two.)

no vlan 1
no vlan 2

VLAN 1 is not configured on the switch.
*VLAN 1 is the default VLAN and cannot be removed.
The network administrator is using the wrong command.
*The switch is configured in VTP client mode.
Ports are still assigned to VLAN 1 and VLAN 2 and the VLANs cannot be deleted until those assignments are removed.

8 How many host addresses may be assigned on each subnetwork when using the 130.68.0.0 network address with a subnet mask of 255.255.248.0?

30
256
*2046
2048
4094
4096

9 What is another term for latency?

backoff algorithm
hold-down timer
*propagation delay
redundancy

10 What are the two authentication options supported by PPP?

PAP and clear text
*PAP and CHAP
CHAP and clear text
PPP does not support authentication

11 Which statement best describes the difference between exterior routing protocols and interior routing protocols?

Exterior routing protocols are used for communications within a single autonomous system, and interior routing protocols are used for communications between autonomous systems.
Interior routing protocols are used between neighbor routers, and exterior routing protocols are used between peer routers.
Interior routing protocols are used by mid size companies, and exterior routing protocols are used by large organizations.
*Interior routing protocols are used for communications within a single autonomous system, and exterior routing protocols are used for communications between autonomous systems.

12 Which of the following is a non-ISDN compatible device that requires a terminal adapter to connect to an ISDN network?

NT1
NT2
TA1
TA2
TE1
*TE2

13 Which device imposes boundaries on broadcast traffic?

bridge
repeater
*router
transceiver

14
Refer to exhibit. Given the topology shown in the exhibit, what three commands are needed to configure EIGRP on the Paris router? (Choose three.)

*Paris(config)# router eigrp 100
Paris(config)# router eigrp
Paris(config-router)# network 192.168.6.0
Paris(config-router)# network 192.168.7.0
Paris(config-router)# network 192.168.8.0
Paris(config-router)# network 192.168.9.0

15 Which ISDN channel is used for call setup?

B
*D
X
SS-7
PRI
BRI

16
Host A in the graphic has received its DHCP configuration From R1. Host A is unable to reach the Internet. What could cause this problem?

The DNS server is not on the same LAN as Host A.
The ip helper-address command must be configured on the Ethernet interface.
*Host A did not receive the correct gateway address.
The DHCP service has not been enabled on interface e0.
The router IP address has been excluded From the DHCP pool.
The subnet mask in the network command is incorrect.

17 Which utility can be used to verify connectivity through all seven layers of the OSI model?

netstat
ping
*Telnet
traceroute

18 Which OSI model layer is responsible for regulating the flow of information From source to destination, reliably and accurately?

application
presentation
session
*transport
network

19 Which of the following represents a group of routers under a common administration and is required when configuring routing protocols such as EIGRP?

control group
*autonomous system
corporate system
Domain Name System
local-area network
wide-area network

20 How is RIP configured on a router?

RIP is configured globally and then assigned an IP address and subnet mask.
RIP is configured globally and then applied to each interface that will participate in the RIP routing process.
RIP is configured individually on each interface that will participate in the RIP routing process.
*RIP is enabled globally and then networks are associated with the RIP routing process.

21 What are the advantages of OSPF in comparison with RIP v2? (Choose two.)

OSPF provides support for Classless Interdomain Routing but RIP v2 does not.
*OSPF may result in faster convergence, due to triggered updates.
OSPF's built-in features make it easy to design, implement, and troubleshoot.
*OSPF routers build a complete view of the network, reducing the potential for routing loops.
OSPF sends periodic link state advertisements to keep the link active.
OSPF routers have lower memory and processor requirements.

22 Which protocol of the TCP/IP model internet layer provides connectionless, best-effort-delivery of datagrams?

ARP
ICMP
*IP
RARP
TCP
DNS

23 Which of the following is an alternative to a dedicated WAN link?

X.25
ISDN
*T1
DS3

24
The internetwork in the diagram is assigned a Class B network address of 130.68.0.0. The network cannot use subnet zero but will use a single network mask for the internetwork. What subnet mask should be assigned to ensure the maximum number of host addresses are available for use on each subnetwork?

255.255.224.0
255.255.240.0
255.255.248.0
255.255.252.0
255.255.255.224
255.255.255.240

25
A packet destined for 10.188.12.12 is received by a router with the configuration shown in the graphic. The routing table displays the following lines:

10.0.0.0/24 is subnetted, 3 subnets
R 10.5.5.0 [120/1] via 10.20.20.2, 00:00:18, Serial0/0
C 10.20.20.0 is directly connected, Serial0/0
C 10.10.10.0 is directly connected, FastEthernet0/0

What will happen?

The packet will be forwarded to the next hop.
The router will forward the packet out all ports.
*The packet will be dropped.
The router will forward the packet out all ports except the receiving port.

26 How is an access list implemented in a router?

Enter the access list statements globally and apply the list globally.
*Enter the access list statements globally and apply the list to a specific interface.
Enter the access list statements on a specific interface and apply the list globally.
Enter the access list statements on a specific interface and apply the list to that same interface.

27 What are the primary functions of a Layer 2 Ethernet switch? (Choose three.)

*filters traffic between LAN segments
*achieves greater bandwidth per user
prevents hosts From sending broadcasts
*increases the number of broadcast domains through VLANs
decreases the number of collision domains through VLANs

28 Which of the following describes the CIR in a Frame Relay network?

*guaranteed data rate that the service provider commits to providing
maximum data burst rate that the switch can handle
number of simultaneous virtual circuits available From a service provider
number of simultaneous DLCIs that can be established across the cloud

29 Which statements reflect the process of common LAN protocols accessing the media? (Choose three.)

*Ethernet is a non-deterministic protocol that allows the first node that accesses the medium to transmit its data.
*Token Ring is a deterministic protocol that allows only one node within the ring a turn to transmit data before passing control to the next node.
Token Ring is a non-deterministic protocol that uses a first-come, first-serve approach for nodes to seize the token and transmit data.
FDDI networks use a deterministic approach to assure that each node has fair access to the medium.
*Ethernet and Token Ring networks avoid collisions by allowing only one node to transmit at a time.
Ethernet is a deterministic protocol that uses CSMA/CD to assure that each node takes turns to access the medium.

30 What is the purpose of DLCIs in Frame Relay?

They determine the Frame Relay encapsulation type.
*They identify the logical circuit between a local router and a Frame Relay WAN switch.
They represent the keepalives used to maintain the PVC in an active state.
They represent the physical address of the router attached to a Frame Relay network.

31 An administrator has an older 1900 switch located on the edge of the network. What can the network administrator do to ensure that it does not become the root bridge of the spanning-tree network?

decrease the BPDU hello timer update on the 1900
assign the highest IP address to the switch that should be the root
assign the lowest IP address to new root bridge
*assign the lowest priority to the switch that should be the root
assign the highest priority to the new root bridge
decrease the BID on the 1900 switch

32 What command is used to verify that a Frame Relay link is up and operational?

Router# show line
Router# show version
*Router# show interface
Router# show frame-relay
Router# show frame-relay status

33 Which of the following are true regarding bridges and switches? (Choose two.)

Bridges are faster than switches because they have fewer ports.
*A switch is a multiport bridge.
*Bridges and switches learn MAC addresses by examining the source MAC address of each frame received.
A bridge will forward a broadcast but a switch will not.
Bridges and switches increase the size of a collision domain.

34 Which of the following does CHAP authentication use to increase security on a PPP link? (Choose three.)

periodic verification of identity while the link is established
*secure recording of playback attacks
transmission of the CHAP password in plain text
*the use of a unique and random challenge value
the use of a two-way handshake of CHAP exchanges
*identity verification at the startup of a link

35 When a user generates information to be sent on a network, in what order does data encapsulation occur?

data, frame, segment, packet, bits
data, packet, frame, segment, bits
data, packet, segment, frame, bits
*data, segment, packet, frame, bits

36 Which of the following are characteristics of RIPv2? (Choose two.)

requires classful addressing for configured interfaces
*forwards routing updates using multicasts
forwards routing updates using broadcasts
operates as a hybrid routing protocol
*supports variable-length subnet masking

37 Which command will verify that a router is configured with RIPv2 and that the hold-down timer and administrative distance are set to the default values?

show ip route
show interface brief
*show ip protocols
show interface

38
The network in the graphic is using EIGRP with the metrics shown. Router A has a route to network 210.67.130.0 through Router C, with a feasible distance of three. What will happen if the direct link between A and C becomes unavailable? (Choose two.)

DUAL will immediately promote the feasible successor route through Router B to successor route status.
The route to Network C on Router A will be placed in Active status.
The route to Network C on Router A will be placed in Passive status.
Router A will send query packets to all neighbor routers.
Router A will mark the link as down until regularly scheduled update packets are received.

39 What operations can be executed From the Router> prompt? (Choose two.)

*enter privileged mode with the enable command
modify passwords
modify the router name with the hostname command
*view basic router status
view passwords
view the running-configuration with the show running-config command

40 What is the reference point for a connection between a TA and a non-ISDN-compatible device?

*R
S
T
U

41 Which item is a commonly used metric?

ARP
*Hop Count
Acknowledgment Number
Time

42 Which ISDN channels are used for voice, video, and data?

A channels
*B channels
E channels
D channels
Q channels
E channels

43 A static route needs to be configured to network 192.17.10.0/24. This route should have an administrative distance of 180. Which command will configure this route if the IP address of the next hop interface is 10.15.0.1?

Router(config)# ip route 192.17.10.1 255.255.255.0 10.15.0.0 180
*Router(config)# ip route 192.17.10.0 255.255.255.0 10.15.0.1 180
Router(config)# ip route 10.15.0.1 192.17.10.0 255.255.255.0 180
Router (config)# ip static-route 192.17.10.0 255.255.255.255 10.15.0.1 180
Router (config)# ip default-route 192.17.10.0 255.255.255.255 10.15.0.1 180

44 Which statements are true regarding OSPF DR and BDR elections? (Choose three.)

*The command ip ospf prioritypriority number is used to set the priority value that determines the DR.
The default priority value for a router connected to a multiaccess network is 0.
The router with the highest MAC address is elected as the DR when the default priority values are used.
The loopback interface must be configured on the DR.
*The BDR is selected From remaining routers and uses the same criteria applied in the DR election.
*There are no DRs or BDRs on point-to-point links.

45 Which packet-switched WAN technologies are characterized by the use of Permanent Virtual Circuits (PVCs)?

Frame Relay and ISDN
*Frame Relay and X.25
ISDN and X.25
ISDN only

46 Which statement describes the store and forward transmission mode of an Ethernet switch?

It is also referred to as a hybrid mode or as error sensing mode.
It requires the switch to read the first 64 bytes of an Ethernet frame and then begins to forward the data.
It decreases the latency of the transmission but has very little error detection.
*It increases latency with large frames, but error detection is high.

47 Which configuration parameters can a host receive From a DHCP server? (Choose three.)

MAC address
outside global address
*DNS server address
DHCP helper address
*default gateway address
*IP address/subnet mask

48 Which layer of the OSI model can provide connection-oriented and reliable data transfer between two hosts?

application
presentation
session
*transport

49 Which utility shows the route a packet takes to reach its destination?

netstat
ping
Telnet
*traceroute

50 Which command displays the active configuration of a router?

Router# show flash
Router# show configuration
*Router# show running-config
Router# show startup-config

51 In an IPv4 environment, what information is used by the router to forward data packets From one interface of a router to another?

*destination network address
source network address
source MAC address
well known port destination address

52
In an effort to minimize traffic, an administrator decided to keep web traffic From causing the ISDN link to come up by denying WWW traffic to the 192.168.20.5 remote server. Two minutes after making changes to the configuration as shown in the graphic, the administrator notices that web traffic is still passing over the link. What is the most likely cause of the problem?

The dialer-group has not been applied to outbound traffic.
The access-list is incorrectly configured.
Broadcasts are creating "interesting" traffic and keeping the link active.
The command ip access-group 128 out is missing From the bri0/0 interface.

53 Which layer of the OSI model establishes, manages, and terminates sessions between applications?

Layer 7
Layer 6
*Layer 5
Layer 4
Layer 3
Layer 2

54 When using distance-vector routing protocols in a frame relay environment with multiple DLCIs on a single physical router interface, split-horizon issues must be resolved. According to Cisco best practices, what should be configured to manage these issues?

a single network address
multiple LMIs
*subinterfaces
multiple IP addresses on the same subnet

55 Which automatic process is started first whenever power is applied to a Cisco router?

empties contents of NVRAM
looks for the configuration file
*performs a POST
starts the operating system

56 What is the length of a MAC address?

12 bits
24 bits
38 bits
*48 bits

57 Identify the correct pairing of protocols and their classifications.

Routed - IP, RIP
Routed - RIP, OSPF
Routing - IPX, RIP
*Routing - OSPF, RIP

58 Which protocols or applications allow a network administrator to monitor a network? (Choose three.)

FTP
*SNMP
*RMON
*syslog
DHCP
SMTP

59 Which type of encapsulation is recommended to be used to connect two routers From different vendors through a dedicated point-to-point connection?

CIR
FCS
ANSI
*PPP
HDLC

60 Which command will display statistics for all interfaces configured on a router?

list interfaces
*show interfaces
show processes
show statistics

61 What is the correct order of the layers of the OSI reference model, starting at the lowest layer and working up the model?

data link, physical, transport, network, presentation, session, application
physical, data link, network, session, transport, presentation, application
physical, data link, network, transport, presentation, session, application
*physical, data link, network, transport, session, presentation, application
application, session, presentation, transport, data link, network, physical

62 What is the purpose of the IOS enable secret command?

to set password protection on incoming Telnet sessions
*to set password protection on the console terminal
to allow a user access to User mode
to allow a user to enter a password that will be encrypted

63 How are VLANs configured?

by moving switches to different router ports
by changing switchports for each host on the segment
by physically moving equipment to a different network
*through software
through hardware
automatically with a plug and play module

64
The administrator of the network shown in the graphic would like to use VLSM to subnet the company's Class C address. Which subnet masks should be used on the LANs and serial links to waste the fewest host addresses? (Choose three.)

255.255.255.0
255.255.255.192
255.255.255.224
255.255.255.240
255.255.255.248
*255.255.255.252

65 Which fields are common to the TCP and the UDP segments? (Choose two.)

*source address
sequence number
acknowledgement number
options
checksum
*destination port

===================第二套=====================

1 How is spanning-tree path cost determined by default?

　 total hop count
√ sum of the costs based on bandwidth
　 dynamically determined based on load
　 individual link cost based on latency

2 Which configuration parameters can a host receive From a DHCP server? (Choose three.)

　 MAC address
　 outside global address
√ DNS server address
　 DHCP helper address
√ default gateway address
√ IP address/subnet mask

3 When using distance-vector routing protocols in a frame relay environment with multiple DLCIs on a single physical router interface, split-horizon issues must be resolved. According to Cisco best practices, what should be configured to manage these issues?

　 a single network address
　 multiple LMIs
√ subinterfaces
　 multiple IP addresses on the same subnet

4 Which type of encapsulation is recommended to be used to connect two routers From different vendors through a dedicated point-to-point connection?

　 CIR
　 FCS
　 ANSI
√ PPP
　 HDLC

5 What are the two basic functions that a router uses to relay packets?

　 filtering and switching
　 path determination and filtering
√ path determination and switching
　 traffic analysis and filtering

6

In an effort to minimize traffic, an administrator decided to keep web traffic From causing the ISDN link to come up by denying WWW traffic to the 192.168.20.5 remote server. Two minutes after making changes to the configuration as shown in the graphic, the administrator notices that web traffic is still passing over the link. What is the most likely cause of the problem?

　 The dialer-group has not been applied to outbound traffic.
　 The access-list is incorrectly configured.
　 Broadcasts are creating "interesting" traffic and keeping the link active.
√ The command ip access-group 128 out is missing From the bri0/0 interface.

7 Which protocol of the TCP/IP model internet layer provides connectionless, best-effort-delivery of datagrams?

　 ARP
　 ICMP
√ IP
　 RARP
　 TCP
　 DNS

8 A static route needs to be configured to network 192.17.10.0/24. This route should have an administrative distance of 180. Which command will configure this route if the IP address of the next hop interface is 10.15.0.1?

　 Router(config)# ip route 192.17.10.1 255.255.255.0 10.15.0.0 180
√ Router(config)# ip route 192.17.10.0 255.255.255.0 10.15.0.1 180
　 Router(config)# ip route 10.15.0.1 192.17.10.0 255.255.255.0 180
　 Router (config)# ip static-route 192.17.10.0 255.255.255.255 10.15.0.1 180
　 Router (config)# ip default-route 192.17.10.0 255.255.255.255 10.15.0.1 180

9 Which statements reflect the process of common LAN protocols accessing the media? (Choose three.)

　 Ethernet is a non-deterministic protocol that allows the first node that accesses the medium to transmit its data.
√ Token Ring is a deterministic protocol that allows only one node within the ring a turn to transmit data before passing control to the next node.
　 Token Ring is a non-deterministic protocol that uses a first-come, first-serve approach for nodes to seize the token and transmit data.
√ FDDI networks use a deterministic approach to assure that each node has fair access to the medium.
　 Ethernet and Token Ring networks avoid collisions by allowing only one node to transmit at a time.
√ Ethernet is a deterministic protocol that uses CSMA/CD to assure that each node takes turns to access the medium.

10 Identify the correct pairing of protocols and their classifications.

　 Routed - IP, RIP
　 Routed - RIP, OSPF
　 Routing - IPX, RIP
√ Routing - OSPF, RIP

11 Which item is a commonly used metric?

　 ARP
√ Hop Count
　 Acknowledgment Number
　 Time

12 Which of the following represents a group of routers under a common administration and is required when configuring routing protocols such as EIGRP?

　 control group
√ autonomous system
　 corporate system
　 Domain Name System
　 local-area network
　 wide-area network

13 Which utility shows the route a packet takes to reach its destination?

　 netstat
　 ping
　 Telnet
√ traceroute

14

A partial configuration of a Catalyst 1900 switch is shown in the graphic. Why do the following commands fail to delete VLAN1 and VLAN2? (Choose two.)

no vlan 1
no vlan 2

　 VLAN 1 is not configured on the switch.
√ VLAN 1 is the default VLAN and cannot be removed.
　 The network administrator is using the wrong command.
√ The switch is configured in VTP client mode.
　 Ports are still assigned to VLAN 1 and VLAN 2 and the VLANs cannot be deleted until those assignments are removed.

15 Which layer of the OSI model can provide connection-oriented and reliable data transfer between two hosts?

　 application
　 presentation
　 session
√ transport

16

A ping 192.1.1.20 command is issued on workstation A to determine if workstation B can be reached. What events will occur if this command is successful? (Choose two.)

　 The router will block the ping request message.
　 The router will reply to the echo request with a proxy ping response.
　 Workstation A will send a UDP ping request message to workstation B.
　 Workstation B will send a UDP ping reply message to workstation A.
√ Workstation A will send an ICMP echo request message to workstation B.
√ Workstation B will send an ICMP echo reply message to workstation A.

17 Which packet-switched WAN technologies are characterized by the use of Permanent Virtual Circuits (PVCs)?

　 Frame Relay and ISDN
√ Frame Relay and X.25
　 ISDN and X.25
　 ISDN only

18 In an IPv4 environment, what information is used by the router to forward data packets From one interface of a router to another?

√ destination network address
　 source network address
　 source MAC address
　 well known port destination address

19 Which statement best describes the difference between exterior routing protocols and interior routing protocols?

　 Exterior routing protocols are used for communications within a single autonomous system, and interior routing protocols are used for communications between autonomous systems.
　 Interior routing protocols are used between neighbor routers, and exterior routing protocols are used between peer routers.
　 Interior routing protocols are used by mid size companies, and exterior routing protocols are used by large organizations.
√ Interior routing protocols are used for communications within a single autonomous system, and exterior routing protocols are used for communications between autonomous systems.

20 What is the term for the cabling that connects the customer premises equipment to the CO switch?

　 demarc
　 local loop
　 final mile
√ DTE
　 trunk line

21 Which command will display statistics for all interfaces configured on a router?

　 list interfaces
√ show interfaces
　 show processes
　 show statistics

22 An administrator has an older 1900 switch located on the edge of the network. What can the network administrator do to ensure that it does not become the root bridge of the spanning-tree network?

　 decrease the BPDU hello timer update on the 1900
　 assign the highest IP address to the switch that should be the root
　 assign the lowest IP address to new root bridge
√ assign the lowest priority to the switch that should be the root
　 assign the highest priority to the new root bridge
　 decrease the BID on the 1900 switch

23

The administrator of the network shown in the graphic would like to use VLSM to subnet the company's Class C address. Which subnet masks should be used on the LANs and serial links to waste the fewest host addresses? (Choose three.)

　 255.255.255.0
√ 255.255.255.192
　 255.255.255.224
√ 255.255.255.240
　 255.255.255.248
√ 255.255.255.252

24 How is RIP configured on a router?

　 RIP is configured globally and then assigned an IP address and subnet mask.
　 RIP is configured globally and then applied to each interface that will participate in the RIP routing process.
　 RIP is configured individually on each interface that will participate in the RIP routing process.
√ RIP is enabled globally and then networks are associated with the RIP routing process.

25 What is the purpose of DLCIs in Frame Relay?

　 They determine the Frame Relay encapsulation type.
√ They identify the logical circuit between a local router and a Frame Relay WAN switch.
　 They represent the keepalives used to maintain the PVC in an active state.
　 They represent the physical address of the router attached to a Frame Relay network.

26 Which of the following is a non-ISDN compatible device that requires a terminal adapter to connect to an ISDN network?

　 NT1
　 NT2
　 TA1
　 TA2
　 TE1
√ TE2

27 What is the correct order of the layers of the OSI reference model, starting at the lowest layer and working up the model?

　 data link, physical, transport, network, presentation, session, application
　 physical, data link, network, session, transport, presentation, application
　 physical, data link, network, transport, presentation, session, application
√ physical, data link, network, transport, session, presentation, application
　 application, session, presentation, transport, data link, network, physical

28

Refer to exhibit. Given the topology shown in the exhibit, what three commands are needed to configure EIGRP on the Paris router? (Choose three.)

√ Paris(config)# router eigrp 100
　 Paris(config)# router eigrp
　 Paris(config-router)# network 192.168.6.0
　 Paris(config-router)# network 192.168.7.0
　 Paris(config-router)# network 192.168.8.0
　 Paris(config-router)# network 192.168.9.0

29 Which of the following describes the CIR in a Frame Relay network?

√ guaranteed data rate that the service provider commits to providing
　 maximum data burst rate that the switch can handle
　 number of simultaneous virtual circuits available From a service provider
　 number of simultaneous DLCIs that can be established across the cloud

30 Which statement describes the store and forward transmission mode of an Ethernet switch?

　 It is also referred to as a hybrid mode or as error sensing mode.
　 It requires the switch to read the first 64 bytes of an Ethernet frame and then begins to forward the data.
　 It decreases the latency of the transmission but has very little error detection.
√ It increases latency with large frames, but error detection is high.

31 Which device imposes boundaries on broadcast traffic?

　 bridge
　 repeater
√ router
　 transceiver

32 What are the advantages of OSPF in comparison with RIP v2? (Choose two.)

　 OSPF provides support for Classless Interdomain Routing but RIP v2 does not.
√ OSPF may result in faster convergence, due to triggered updates.
　 OSPF's built-in features make it easy to design, implement, and troubleshoot.
√ OSPF routers build a complete view of the network, reducing the potential for routing loops.
　 OSPF sends periodic link state advertisements to keep the link active.
　 OSPF routers have lower memory and processor requirements.

33 Which command will verify that a router is configured with RIPv2 and that the hold-down timer and administrative distance are set to the default values?

　 show ip route
　 show interface brief
√ show ip protocols
　 show interface

34 How is an access list implemented in a router?

　 Enter the access list statements globally and apply the list globally.
√ Enter the access list statements globally and apply the list to a specific interface.
　 Enter the access list statements on a specific interface and apply the list globally.
　 Enter the access list statements on a specific interface and apply the list to that same interface.

35 Which statements are true regarding OSPF DR and BDR elections? (Choose three.)

√ The command ip ospf prioritypriority number is used to set the priority value that determines the DR.
　 The default priority value for a router connected to a multiaccess network is 0.
　 The router with the highest MAC address is elected as the DR when the default priority values are used.
　 The loopback interface must be configured on the DR.
√ The BDR is selected From remaining routers and uses the same criteria applied in the DR election.
√ There are no DRs or BDRs on point-to-point links.

36 Which command displays the active configuration of a router?

　 Router# show flash
　 Router# show configuration
√ Router# show running-config
　 Router# show startup-config

37 Which ISDN channel is used for call setup?

　 B
√ D
　 X
　 SS-7
　 PRI
　 BRI

38 What is the length of a MAC address?

　 12 bits
　 24 bits
　 38 bits
√ 48 bits

39 Which protocols or applications allow a network administrator to monitor a network? (Choose three.)

　 FTP
√ SNMP
√ RMON
√ syslog
　 DHCP
　 SMTP

40 What is the purpose of the IOS enable secret command?

　 to set password protection on incoming Telnet sessions
√ to set password protection on the console terminal
　 to allow a user access to User mode
　 to allow a user to enter a password that will be encrypted

41 Which of the following does CHAP authentication use to increase security on a PPP link? (Choose three.)

　 periodic verification of identity while the link is established
√ secure recording of playback attacks
　 transmission of the CHAP password in plain text
√ the use of a unique and random challenge value
　 the use of a two-way handshake of CHAP exchanges
√ identity verification at the startup of a link

42 Which three statements describe the operation of routing with EIGRP? (Choose three.)

√ As new neighbors are discovered, entries are placed in a neighbor table.
　 If the feasible successor has a higher advertised cost than the current successor route, then it becomes the primary route.
√ If hello packets are not received within the hold time, DUAL must recalculate the topology.
√ The reported distance is the distance to a destination as advertised by a neighbor.
　 EIGRP maintains full knowledge of the network topology in the topology table and exchanges full routing information with neighboring routers in every update.
　 EIGRP builds one routing table that contains routes for all configured routed protocols.

43 What command is used to verify that a Frame Relay link is up and operational?

　 Router# show line
　 Router# show version
√ Router# show interface
　 Router# show frame-relay
　 Router# show frame-relay status

44 Which ISDN channels are used for voice, video, and data?

　 A channels
√ B channels
　 E channels
　 D channels
　 Q channels
　 E channels

45

A packet destined for 10.188.12.12 is received by a router with the configuration shown in the graphic. The routing table displays the following lines:

10.0.0.0/24 is subnetted, 3 subnets
R 10.5.5.0 [120/1] via 10.20.20.2, 00:00:18, Serial0/0
C 10.20.20.0 is directly connected, Serial0/0
C 10.10.10.0 is directly connected, FastEthernet0/0

What will happen?

　 The packet will be forwarded to the next hop.
　 The router will forward the packet out all ports.
√ The packet will be dropped.
　 The router will forward the packet out all ports except the receiving port.

46 How many host addresses may be assigned on each subnetwork when using the 130.68.0.0 network address with a subnet mask of 255.255.248.0?

　 30
　 256
√ 2046
　 2048
　 4094
　 4096

47 Which automatic process is started first whenever power is applied to a Cisco router?

　 empties contents of NVRAM
　 looks for the configuration file
√ performs a POST
　 starts the operating system

48 Which utility can be used to verify connectivity through all seven layers of the OSI model?

　 netstat
　 ping
√ Telnet
　 traceroute

49 Which layer of the OSI model establishes, manages, and terminates sessions between applications?

　 Layer 7
　 Layer 6
√ Layer 5
　 Layer 4
　 Layer 3
　 Layer 2

50 When a user generates information to be sent on a network, in what order does data encapsulation occur?

　 data, frame, segment, packet, bits
　 data, packet, frame, segment, bits
　 data, packet, segment, frame, bits
√ data, segment, packet, frame, bits

51 Which of the following are true regarding bridges and switches? (Choose two.)

√ Bridges are faster than switches because they have fewer ports.
√ A switch is a multiport bridge.
　 Bridges and switches learn MAC addresses by examining the source MAC address of each frame received.
　 A bridge will forward a broadcast but a switch will not.
　 Bridges and switches increase the size of a collision domain.

52 A network administrator wants to reconfigure a router. Which of the following will clear the running-configuration in preparation for the reconfiguration?

　 erase running-config and then reload
　 erase running-config
　 reload
　 no running-config and then reload
√ erase startup-config and then reload
　 delete running-config

53 What is the reference point for a connection between a TA and a non-ISDN-compatible device?

√ R
　 S
　 T
　 U

54 Which fields are common to the TCP and the UDP segments? (Choose two.)

√ source address
　 sequence number
　 acknowledgement number
　 options
　 checksum
√ destination port

55 Which OSI model layer is responsible for regulating the flow of information From source to destination, reliably and accurately?

　 application
　 presentation
　 session
√ transport
　 network

56 What are the primary functions of a Layer 2 Ethernet switch? (Choose three.)

　 filters traffic between LAN segments
√ achieves greater bandwidth per user
　 prevents hosts From sending broadcasts
√ increases the number of broadcast domains through VLANs
√ decreases the number of collision domains through VLANs

57 What operations can be executed From the Router> prompt? (Choose two.)

√ enter privileged mode with the enable command
　 modify passwords
　 modify the router name with the hostname command
√ view basic router status
　 view passwords
　 view the running-configuration with the show running-config command

58

Host A in the graphic has received its DHCP configuration From R1. Host A is unable to reach the Internet. What could cause this problem?

　 The DNS server is not on the same LAN as Host A.
　 The ip helper-address command must be configured on the Ethernet interface.
√ Host A did not receive the correct gateway address.
　 The DHCP service has not been enabled on interface e0.
　 The router IP address has been excluded From the DHCP pool.
　 The subnet mask in the network command is incorrect.

59

The network in the graphic is using EIGRP with the metrics shown. Router A has a route to network 210.67.130.0 through Router C, with a feasible distance of three. What will happen if the direct link between A and C becomes unavailable? (Choose two.)

　 DUAL will immediately promote the feasible successor route through Router B to successor route status.
√ The route to Network C on Router A will be placed in Active status.
　 The route to Network C on Router A will be placed in Passive status.
√ Router A will send query packets to all neighbor routers.
　 Router A will mark the link as down until regularly scheduled update packets are received.

60 How are VLANs configured?

　 by moving switches to different router ports
　 by changing switchports for each host on the segment
　 by physically moving equipment to a different network
√ through software
　 through hardware
　 automatically with a plug and play module

61 What are the two authentication options supported by PPP?

　 PAP and clear text
√ PAP and CHAP
　 CHAP and clear text
　 PPP does not support authentication

62 What is another term for latency?

　 backoff algorithm
　 hold-down timer
√ propagation delay
　 redundancy

63 Which of the following are characteristics of RIPv2? (Choose two.)

　 requires classful addressing for configured interfaces
　 forwards routing updates using multicasts
√ forwards routing updates using broadcasts
　 operates as a hybrid routing protocol
√ supports variable-length subnet masking

64 Which of the following is an alternative to a dedicated WAN link?

　 X.25
√ ISDN
　 T1
　 DS3

65

The internetwork in the diagram is assigned a Class B network address of 130.68.0.0. The network cannot use subnet zero but will use a single network mask for the internetwork. What subnet mask should be assigned to ensure the maximum number of host addresses are available for use on each subnetwork?

√ 255.255.224.0
　 255.255.240.0
　 255.255.248.0
　 255.255.252.0
　 255.255.255.224
　 255.255.255.240

========================第三套==========================
1 Which statement describes dynamic routing correctly?

√ Dynamic routing automatically adjusts for topology or traffic changes.
　 Dynamic routing must always be used to reach a stub network.
　 Dynamic routing uses route information entered by an administrator.
　 Dynamic routing reveals everything known about an entire autonomous system.

2 How is RIP configured on a router?

　 RIP is configured globally and then assigned an IP address and subnet mask.
　 RIP is configured globally and then applied to each interface that will participate in the RIP routing process.
　 RIP is configured individually on each interface that will participate in the RIP routing process.
√ RIP is enabled globally and then networks are associated with the RIP routing process.

3 Which command will successfully configure a router to use PPP encapsulation on one of its links?

　 router> encapsulation ppp
　 router# encapsulation ppp
　 router(config)# encapsulation ppp
√ router(config-if)# encapsulation ppp

4 What is the length of a MAC address?

　 12 bits
　 24 bits
　 38 bits
√ 48 bits

5 Which utility shows the route a packet takes to reach its destination?

　 netstat
　 ping
　 Telnet
√ traceroute

6 In reference to the TCP/IP model, which protocol is used to determine the network access layer address associated with a known Internet layer address?

√ ARP
　 ICMP
　 IP
　 RARP
　 TCP
　 UDP

7 Which address does a bridge use to build its bridging table?

　 destination IP address
√ destination MAC address
　 source IP address
　 source MAC address

8 Which statement is correct concerning routing and routed protocols?

√ A routed protocol allows the routers to communicate with other routers and maintain tables for a routing protocol.
　 A routing protocol allows routers to communicate with other routers and maintain tables for a routed protocol.
　 Routers only need to use routing protocols to work properly.
　 There is no difference between routed and routing protocols.

9

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Which commands will configure the router ports with IP addresses as shown in the diagram? (Choose three.)

√ R1(config)# interface s0
R1(config-if)# ip address 10.1.1.146 255.255.255.252
√ R1(config)# interface e0
R1(config-if)# ip address 10.1.7.254 255.255.252.0
　 R1(config)# interface s0
R1(config-if)# ip address 10.1.1.147 255.255.255.0
　 R1(config)# interface e0
R1(config-if)# ip address 10.1.4.0 255.255.252.0
　 R2(config)# interface e0
R2(config-if)# ip address 10.1.16.1 255.255.255.0
√ R2(config)# interface e0
R2(config-if)# ip address 10.1.31.254 255.255.240.0

10 How are VLANs configured?

　 by moving switches to different router ports
　 by changing switchports for each host on the segment
　 by physically moving equipment to a different network
√ through software
　 through hardware
　 automatically with a plug and play module

11 A mid-sized company has five remote locations with 55 end users at each location. The network administrator was assigned two consecutive Class C networks. Which three interior routing protocols will support this addressing scheme? (Choose three.)

　 RIP v1
√ RIP v2
√ EIGRP
√ OSPF
　 BGP

12 Which of the following WAN services uses two data link layer encapsulations, one for data and one for signaling?

　 ISDN
　 Frame Relay
√ ATM
　 FDDI

13 What can be created by borrowing bits From the host portion of an IP address?

　 extended IP addresses
　 additional IP addresses
　 segments
√ subnetworks
　 smaller collision domains

14 Which of the following authentication processes provides protection against playback attacks?

√ CHAP
　 DDI
　 PAP
　 TCP

15 Within a Frame Relay network, which methods are used by switches to inform DTEs of congestion?

　 CCP and LMI
　 CIR and LATE
　 DLCI and SPID
√ FECN and BECN

16 Which mode will a router enter if it is unable to locate a valid startup configuration file during the boot process?

　 boot mode
　 config mode
　 RXBOOT mode
　 ROM monitor mode
√ setup mode
　 turnkey mode

17 Which router parameters can be set From global configuration mode? (Choose two.)

　 IP address
　 Telnet password
√ hostname
　 console password
　 subnet mask
√ enable secret password

18 Which ISDN channel is used for call setup?

　 B
√ D
　 X
　 SS-7
　 PRI
　 BRI

19 What are the advantages of OSPF in comparison with RIP v2? (Choose two.)

　 OSPF provides support for Classless Interdomain Routing but RIP v2 does not.
√ OSPF may result in faster convergence, due to triggered updates.
　 OSPF's built-in features make it easy to design, implement, and troubleshoot.
√ OSPF routers build a complete view of the network, reducing the potential for routing loops.
　 OSPF sends periodic link state advertisements to keep the link active.
　 OSPF routers have lower memory and processor requirements.

20 Which command will display the name of the Cisco IOS currently running on a router?

　 show ip interfaces
　 show ip route
　 show cdp nei detail
√ show version

21

http://assessment.netacad.net/assessment/images/1816.jpg" />
Refer to the graphic. This company was assigned a Class C network address for its two sites. The network administrator subnetted accordingly and configured each router with RIP. However, these routers are unable to connect to each other. What could be the problem?

　 RIP cannot be used in place of a static route.
√ RIPv1 was configured instead of RIPv2.
　 RIPv2 was configured instead of RIPv1.
　 RIP does not support stub networks.

22 What is the command syntax used to create a subinterface?

√ Router(config-if)# int s0.115 point-to-point
　 Router(config-if)# int s0 subinterface 115 point-to-point
　 Router(config-if)# subinterface 115 point-to-point
　 Router(config-if)# subinterface s0.115 point-to-point

23 How is the number 225 represented in binary?

　 11001111
　 11011011
　 11110011
√ 11100001

24 What enables routers to learn of destination networks?

　 proxy ARP
　 CAM table exchanges
　 host name tables
√ routing protocols
　 DNS lookups

25 For the purpose of forwarding packets, which protocol manages communication between routers regarding available routes ?

　 DNS
　 ICMP
√ RIP
　 ARP
　 CDP
　 STP

26 What is the purpose of the show cdp neighbors command?

　 to display a summary of the configurations of all directly attached Cisco devices
√ to display information about all Cisco devices that are directly connected to a local device
　 to display information about all Cisco networks in the WAN
　 to display addressing information about all remote routers
　 to display the names of all OSPF neighbors in the local area

27 Which Layer 4 protocol is connection-oriented and reliable?

　 ICMP
√ TCP
　 TFTP
　 UDP
　 HTTP

28 Which item best describes the ping command?

　 It uses ICMP echo packets to verify connectivity at the TCP/IP internet layer.
√ It checks for connectivity at the TCP/IP application layer.
　 It uses Time to Live (TTL) values to generate messages From each router used along a path.
　 It verifies sliding window settings at the TCP/IP transport layer.

29 Which of the following commands sets a condition to allow packets through a named ACL?

　 adjust
　 apply
　 control
√ permit

30 Which of the following is the reference point between the NT1 and the phone company network?

　 R
　 S
　 T
√ U

31 Which statements describe the operation of VLANs? (Choose two.)

　 All switch ports assigned to a VLAN are part of the same collision domain.
√ All switch ports assigned to a VLAN are part of the same broadcast domain.
　 Using VLANs to logically organize workgroups minimizes latency in the network.
　 Members can be assigned to VLANs based on port ID, MAC address, or protocol.
√ Multiple VLANs can be assigned to a single, Layer 3 network address and routers can be used to route traffic between VLANs.

32

http://assessment.netacad.net/assessment/images/1695.jpg" />
The switches in the graphic are configured for VTP as shown. Select the statements that correctly describe the operation of these switches. (Choose two.)

　 A new VLAN can be added to Switch1 and that information will be added only to Switch2.
　 An existing VLAN can be deleted From Switch2 and that VLAN will be deleted From Switch1 and Switch4.
　 A new VLAN can be added to Switch4 and that information will be added to Switch1, Switch2, and Switch3.
√ A new VLAN can be added to Switch1 and that information will be added to Switch2 and Switch4.
　 A new VLAN can be added to Switch3 and that information will be added to Switch1, Switch2, and Switch4.
√ An existing VLAN can be deleted From Switch4 and that VLAN will be deleted From Switch1 and Switch2.

33 What is another term for latency?

　 backoff algorithm
　 hold-down timer
√ propagation delay
　 redundancy

34 What are the effects of LAN segmentation using a switch? (Choose three.)

√ dedicated bandwidth between source and destinations
　 enlarged collision domains
　 decreased broadcast domains
√ increased number of collision domains
√ increased latency in the network

35 What is used to resolve known IP addresses to unknown MAC addresses?

　 ARP
　 DNS
　 DHCP
√ RARP

36 Given a router that has already been configured, what is the correct loading sequence when powering on?

　 bootstrap, RAM, operating system
　 bootstrap, configuration file, operating system
√ bootstrap, operating system, configuration file
　 operating system, configuration file, RAM

37 Which layer of the OSI model provides negotiation of data transfer syntax?

　 application
√ presentation
　 session
　 transport
　 network

38

http://assessment.netacad.net/assessment/images/1710.jpg" />
All routers shown in the graphic are part of the same OSPF area. Which routers will PERTH engage in DR and BDR elections? (Choose three.)

　 LONDON
√ PALMER
√ CAIRO
√ FRANKLIN

39 What are the functions of a Layer 2 Ethernet switch? (Choose three.)

　 preventing broadcasts
√ increasing available bandwidth per user
√ decreasing the size of collision domains
√ isolating traffic among segments
　 routing traffic between different networks
　 decreasing the number of broadcast domains

40 Which connection modes are supported on a Frame Relay subinterface? (Choose two.)

　 dynamic
　 multicast
√ multipoint
　 multipoint-to-point
√ point-to-point
　 static

41 Which device uses logical addresses to interconnect networks or subnetworks?

　 hub
　 layer 2 switch
√ router
　 bridge
　 repeater

42 Which fields are common to the TCP and the UDP segments? (Choose two.)

√ source address
　 sequence number
　 acknowledgement number
　 options
　 checksum
√ destination port

43 Which device connects four-wire ISDN subscriber wiring to the conventional two-wire local loop?

√ NT1
　 NT2
　 TE1
　 TE2

44 Which command displays the active configuration of a router?

　 Router# show flash
　 Router# show configuration
√ Router# show running-config
　 Router# show startup-config

45 The ISDN, Frame Relay, and HDLC encapsulations are defined at which layer of the OSI model?

　 network
　 session
√ data link
　 transport
　 physical

46 Which of the following describe the Spanning Tree Protocol? (Choose two.)

　 It prevents routing loops.
　 It prevents broadcasts in a switched network.
　 It operates at Layer 3.
√ It uses BPDUs to select the shortest path in a switched network.
　 It allows a router to load balance across redundant links.
√ It prevents switching loops.

47 An ISDN BRI line can be described as which of the following?

√ 2B + D
　 2D + B
　 23B + D
　 23D + B

48 Which packet-switched WAN technologies are characterized by the use of Permanent Virtual Circuits (PVCs)?

　 Frame Relay and ISDN
√ Frame Relay and X.25
　 ISDN and X.25
　 ISDN only

49 How many host addresses may be assigned on each subnetwork when using the 130.68.0.0 network address with a subnet mask of 255.255.248.0?

　 30
　 256
√ 2046
　 2048
　 4094
　 4096

50 How is spanning-tree path cost determined by default?

　 total hop count
√ sum of the costs based on bandwidth
　 dynamically determined based on load
　 individual link cost based on latency

51 What are two authentication options supported by PPP? (Choose two.)

　 clear text
√ PAP
√ CHAP
　 LCP
　 SLIP

52 Which of the following are commonly used routing metrics? (Choose three.)

　 ARP
√ hop count
　 window size
√ delay
√ load
　 media type

53 Which of the following are types of EIGRP packets? (Choose three.)

√ hello
　 respond
　 DUAL
√ query
√ acknowledgement
　 holddown

54 Which device allows data communication to occur between VLANs?

　 bridge
　 hub
　 switch
√ router

55 Which OSI model layer is responsible for regulating the flow of information From source to destination, reliably and accurately?

　 application
　 presentation
　 session
√ transport
　 network

56 What is the default ISDN encapsulation used on Cisco ISDN routers?

　 SLIP
　 PPP
√ HDLC
　 VPP

57 When connecting two routers From different vendors using a dedicated point-to-point connection, which type of encapsulation should be used?

　 Cisco
　 HDLC
　 IETF
√ PPP

58 Which type of protocol is used between routers to communicate and maintain tables?

　 non-routable
　 routable
√ routed
　 routing

59 Which representations have the same meaning when representing the subnet mask?

　 /10 and 255.224.0.0
　 /15 and 255.255.0.0
√ /21 and 255.255.248.0
　 /24 and 255.255.0.0

60 Network broacast traffic From the Business Department is needlessly reaching the Engineering Department LAN. What can be done to contain this traffic within the Business Department network while maintaining connectivity with enterprise servers and the Internet? (Choose two.)

　 Establish a VTP domain to contain the extraneous traffic.
　 Provide greater bandwidth to the Engineering Department LAN.
　 Utilize full-duplex Ethernet on the Engineering Department LAN.
√ Place the business department on a separate subnet and route between networks.
　 Change the switch IP address to an address on the Engineering Department LAN.
√ Create separate VLANs and subnets for the two departments and route between the two.

=========================第四套============================

1
How is the number 225 represented in binary?
　 11001111
　 11011011
　 11110011
√ 11100001

2
A company with five locations, each requiring a single subnet with
55 IP addresses, was assigned two consecutive Class C addresses.
Which routing protocols will support this addressing scheme? (Choose
three.)
　 RIPv1
√ RIPv2
　 IGRP
√ OSPF
√ EIGRP

3
Which statement is correct concerning routing and routed protocols?
　 A routed protocol allows the routers to communicate with other
routers and maintain tables for a routing protocol.
　 A routing protocol allows routers to communicate with other
routers and maintain tables for a routed protocol.
√ Routers only need to use routing protocols to work properly.
　 There is no difference between routed and routing protocols.

4
An ISDN BRI line can be described as which of the following?
√ 2B + D
　 2D + B
　 23B + D
　 23D + B

5
Which address does a bridge use to build its bridging table?
　 destination IP address
√ destination MAC address
　 source IP address
　 source MAC address

6
For the purpose of forwarding packets, which protocol manages
communication between routers regarding available routes ?
　 DNS
　 ICMP
√ RIP
　 ARP
　 CDP
　 STP

7
What is used to resolve known IP addresses to unknown MAC addresses?
√ ARP
　 DNS
　 DHCP
　 RARP

8
Which LMI types are available with Cisco routers?
　 ANSI, Cisco, HDLC
√ ANSI, Cisco, q933a
　 ANSI, Cisco, DLCI
　 Cisco, IETF, q933a

9
Which type of protocol is used between routers to communicate and
maintain tables?
　 non-routable
　 routable
　 routed
√ routing

10
How is spanning-tree path cost determined by default?
　 total hop count
√ sum of the costs based on bandwidth
　 dynamically determined based on load
　 individual link cost based on latency

11
Which of the following are commonly used routing metrics? (Choose
three.)
　 ARP
√ hop count
　 window size
√ delay
√ load
　 media type

12
What can be created by borrowing bits From the host portion of an IP
address?
　 extended IP addresses
　 additional IP addresses
　 segments
√ subnetworks
　 smaller collision domains

13
Which automatic process is started first whenever power is applied
to a Cisco router?
　 empties contents of NVRAM
　 looks for the configuration file
√ performs a POST
　 starts the operating system

14
Which device uses logical addresses to interconnect networks or
subnetworks?
　 hub
　 layer 2 switch
√ router
　 bridge
　 repeater

15
Which OSI model layer is responsible for regulating the flow of
information From source to destination, reliably and accurately?
　 application
　 presentation
　 session
√ transport
　 network

16
Which mode will a router enter if it is unable to locate a valid
startup configuration file during the boot process?
　 boot mode
　 config mode
　 RXBOOT mode
√ ROM monitor mode
　 setup mode
　 turnkey mode

17
In reference to the TCP/IP model, which protocol is used to
determine the network access layer address associated with a known
Internet layer address?
√ ARP
　 ICMP
　 IP
　 RARP
　 TCP
　 UDP

18
Given a router that has already been configured, what is the correct
loading sequence when powering on?
　 bootstrap, RAM, operating system
√ bootstrap, configuration file, operating system
　 bootstrap, operating system, configuration file
　 operating system, configuration file, RAM

19
Which utility shows the route a packet takes to reach its
destination?
　 netstat
　 ping
　 Telnet
√ traceroute

20
What is the default ISDN encapsulation used on Cisco ISDN routers?
　 SLIP
　 PPP
√ HDLC
　 VPP

21
Which command displays the active configuration of a router?
　 Router# show flash
　 Router# show configuration
√ Router# show running-config
　 Router# show startup-config

22
What is the purpose of the show cdp neighbors command?
　 to display a summary of the configurations of all directly
attached Cisco devices
√ to display information about all Cisco devices that are directly
connected to a local device
　 to display information about all Cisco networks in the WAN
　 to display addressing information about all remote routers
　 to display the names of all OSPF neighbors in the local area

23
What enables routers to learn of destination networks?
　 proxy ARP
　 CAM table exchanges
　 host name tables
√ routing protocols
　 DNS lookups

24
Which device connects four-wire ISDN subscriber wiring to the
conventional two-wire local loop?
√ NT1
　 NT2
　 TE1
　 TE2

25
Which Layer 4 protocol is connection-oriented and reliable?
　 ICMP
√ TCP
　 TFTP
　 UDP
　 HTTP

26
Which statement describes dynamic routing correctly?
√ Dynamic routing automatically adjusts for topology or traffic
changes.
　 Dynamic routing must always be used to reach a stub network.
　 Dynamic routing uses route information entered by an
administrator.
　 Dynamic routing reveals everything known about an entire
autonomous system.

27
Which item best describes the ping command?
√ It uses ICMP echo packets to verify connectivity at the TCP/IP
internet layer.
　 It checks for connectivity at the TCP/IP application layer.
　 It uses Time to Live (TTL) values to generate messages From each
router used along a path.
　 It verifies sliding window settings at the TCP/IP transport layer.

28
Which of the following authentication processes provides protection
against playback attacks?
√ CHAP
　 DDI
　 PAP
　 TCP

29

All routers shown in the graphic are part of the same OSPF area.
Which routers will PERTH engage in DR and BDR elections? (Choose
three.)
√ LONDON
√ PALMER
　 CAIRO
√ FRANKLIN

30
How many host addresses may be assigned on each subnetwork when
using the 130.68.0.0 network address with a subnet mask of
255.255.248.0?
　 30
　 256
√ 2046
　 2048
　 4094
　 4096

31
What is the length of a MAC address?
　 12 bits
　 24 bits
　 38 bits
√ 48 bits

32

Refer to the graphic. This company was assigned a Class C network
address for its two sites. The network administrator subnetted
accordingly and configured each router with RIP. However, these
routers are unable to connect to each other. What could be the
problem?
　 RIP cannot be used in place of a static route.
√ RIPv1 was configured instead of RIPv2.
　 RIPv2 was configured instead of RIPv1.
　 RIP does not support stub networks.

33
Network broacast traffic From the Business Department is needlessly
reaching the Engineering Department LAN. What can be done to contain
this traffic within the Business Department network while
maintaining connectivity with enterprise servers and the Internet?
(Choose two.)
　 Establish a VTP domain to contain the extraneous traffic.
　 Provide greater bandwidth to the Engineering Department LAN.
　 Utilize full-duplex Ethernet on the Engineering Department LAN.
√ Place the business department on a separate subnet and route
between networks.
　 Change the switch IP address to an address on the Engineering
Department LAN.
√ Create separate VLANs and subnets for the two departments and
route between the two.

34
Which of the following is the reference point between the NT1 and
the phone company network?
　 R
　 S
　 T
√ U

35
Which of the following are types of EIGRP packets? (Choose three.)
√ hello
　 respond
√ DUAL
　 query
√ acknowledgement
　 holddown

36
Which representations have the same meaning when representing the
subnet mask?
　 /10 and 255.224.0.0
　 /15 and 255.255.0.0
√ /21 and 255.255.248.0
　 /24 and 255.255.0.0

37
Which of the following commands sets a condition to allow packets
through a named ACL?
　 adjust
　 apply
　 control
√ permit

38
What are the advantages of OSPF in comparison with RIP v2? (Choose
two.)
　 OSPF provides support for Classless Interdomain Routing but RIP v2
does not.
√ OSPF may result in faster convergence, due to triggered updates.
　 OSPF's built-in features make it easy to design, implement, and
troubleshoot.
√ OSPF routers build a complete view of the network, reducing the
potential for routing loops.
　 OSPF sends periodic link state advertisements to keep the link
active.
　 OSPF routers have lower memory and processor requirements.

39
Which of the following is used for the delivery of EIGRP routing
information?
　 Reliable Transport Protocol (RTP)
√ Diffusing Update Algorithm (DUAL)
　 Protocol-Dependent Modules (PDMs)
　 Routing Table Maintenance Protocol (RTMP)

40
The ISDN, Frame Relay, and HDLC encapsulations are defined at which
layer of the OSI model?
　 network
　 session
√ data link
　 transport
　 physical

41
How are VLANs configured?
　 by moving switches to different router ports
　 by changing switchports for each host on the segment
　 by physically moving equipment to a different network
√ through software
　 through hardware
　 automatically with a plug and play module

42
Which device allows data communication to occur between VLANs?
　 bridge
　 hub
　 switch
√ router

43
Which statements describe the operation of VLANs? (Choose two.)
　 All switch ports assigned to a VLAN are part of the same collision
domain.
　 All switch ports assigned to a VLAN are part of the same broadcast
domain.
√ Using VLANs to logically organize workgroups minimizes latency in
the network.
　 Members can be assigned to VLANs based on port ID, MAC address, or
protocol.
√ Multiple VLANs can be assigned to a single, Layer 3 network
address and routers can be used to route traffic between VLANs.

44

The switches in the graphic are configured for VTP as shown. Select
the statements that correctly describe the operation of these
switches. (Choose two.)
√ A new VLAN can be added to Switch1 and that information will be
added only to Switch2.
　 An existing VLAN can be deleted From Switch2 and that VLAN will be
deleted From Switch1 and Switch4.
　 A new VLAN can be added to Switch4 and that information will be
added to Switch1, Switch2, and Switch3.
√ A new VLAN can be added to Switch1 and that information will be
added to Switch2 and Switch4.
　 A new VLAN can be added to Switch3 and that information will be
added to Switch1, Switch2, and Switch4.
　 An existing VLAN can be deleted From Switch4 and that VLAN will be
deleted From Switch1 and Switch2.

45
Which of the following WAN services uses two data link layer
encapsulations, one for data and one for signaling?
√ ISDN
　 Frame Relay
　 ATM
　 FDDI

46
When connecting two routers From different vendors using a dedicated
point-to-point connection, which type of encapsulation should be
used?
　 Cisco
　 HDLC
　 IETF
√ PPP

47
What are two authentication options supported by PPP? (Choose two.)
　 clear text
√ PAP
√ CHAP
　 LCP
　 SLIP

48
What is another term for latency?
　 backoff algorithm
　 hold-down timer
√ propagation delay
　 redundancy

49
Which command will successfully configure a router to use PPP
encapsulation on one of its links?
　 router> encapsulation ppp
　 router# encapsulation ppp
　 router(config)# encapsulation ppp
√ router(config-if)# encapsulation ppp

50
Which ISDN channel is used for call setup?
　 B
√ D
　 X
　 SS-7
　 PRI
　 BRI

51
What are the effects of LAN segmentation using a switch? (Choose
three.)
√ dedicated bandwidth between source and destinations
　 enlarged collision domains
　 decreased broadcast domains
√ increased number of collision domains
√ increased latency in the network

52
Which router parameters can be set From global configuration mode?
(Choose two.)
　 IP address
　 Telnet password
√ hostname
　 console password
　 subnet mask
√ enable secret password

53
Which of the following describe the Spanning Tree Protocol? (Choose
two.)
　 It prevents routing loops.
　 It prevents broadcasts in a switched network.
　 It operates at Layer 3.
√ It uses BPDUs to select the shortest path in a switched network.
　 It allows a router to load balance across redundant links.
√ It prevents switching loops.

54
Which packet-switched WAN technologies are characterized by the use
of Permanent Virtual Circuits (PVCs)?
　 Frame Relay and ISDN
√ Frame Relay and X.25
　 ISDN and X.25
　 ISDN only

55
Within a Frame Relay network, which methods are used by switches to
inform DTEs of congestion?
　 CCP and LMI
　 CIR and LATE
　 DLCI and SPID
√ FECN and BECN

56
Which layer of the OSI model provides negotiation of data transfer
syntax?
　 application
　 presentation
　 session
√ transport
　 network

57
What is the command syntax used to create a subinterface?
√ Router(config-if)# int s0.115 point-to-point
　 Router(config-if)# int s0 subinterface 115 point-to-point
　 Router(config-if)# subinterface 115 point-to-point
　 Router(config-if)# subinterface s0.115 point-to-point

58
What are the functions of a Layer 2 Ethernet switch? (Choose three.)
　 preventing broadcasts
√ increasing available bandwidth per user
√ decreasing the size of collision domains
√ isolating traffic among segments
　 routing traffic between different networks
　 decreasing the number of broadcast domains

59
Which command will display the name of the Cisco IOS currently
running on a router?
　 show ip interfaces
　 show ip route
　 show cdp nei detail
√ show version

60
Which connection modes are supported on a Frame Relay subinterface?
(Choose two.)
　 dynamic
　 multicast
√ multipoint
　 multipoint-to-point
√ point-to-point
　 static

61
How is RIP configured on a router?
　 RIP is configured globally and then assigned an IP address and
subnet mask.
　 RIP is configured globally and then applied to each interface that
will participate in the RIP routing process.
　 RIP is configured individually on each interface that will
participate in the RIP routing process.
√ RIP is enabled globally and then networks are associated with the
RIP routing process.

62

In an effort to minimize traffic, an administrator decided to keep
web traffic From causing the ISDN link to come up by denying WWW
traffic to the 192.168.20.5 remote server. Two minutes after making
changes to the configuration as shown in the graphic, the
administrator notices that web traffic is still passing over the
link. What is the most likely cause of the problem?
　 The dialer-group has not been applied to outbound traffic.
　 The access-list is incorrectly configured.
　 Broadcasts are creating "interesting" traffic and keeping the link
active.
√ The command ip access-group 128 out is missing From the bri0/0
interface.

63
Which fields are common to the TCP and the UDP segments? (Choose
two.)
√ source address
　 sequence number
　 acknowledgement number
　 options
　 checksum
√ destination port

64

Which commands will configure the router ports with IP addresses as
shown in the diagram? (Choose three.)
√ R1(config)# interface s0
R1(config-if)# ip address 10.1.1.146 255.255.255.252
√ R1(config)# interface e0
R1(config-if)# ip address 10.1.7.254 255.255.252.0
　 R1(config)# interface s0
R1(config-if)# ip address 10.1.1.147 255.255.255.0
　 R1(config)# interface e0
R1(config-if)# ip address 10.1.4.0 255.255.252.0
　 R2(config)# interface e0
R2(config-if)# ip address 10.1.16.1 255.255.255.0
√ R2(config)# interface e0
R2(config-if)# ip address 10.1.31.254 255.255.240.0