CCNA 4 Final Exam 2011 Answers Updated

1

Refer to the exhibit. Branch A has a non-Cisco router that is using IETF encapsulation and

Branch B has a Cisco router. After the commands that are shown are entered, R1 and R2 fail to

establish the PVC. The R2 LMI is Cisco, and the R1 LMI is ANSI. The LMI is successfully

established at both locations. Why is the PVC failing?

The PVC to R1 must be point-to-point.

LMI types must match on each end of a PVC.

The frame relay PVCs cannot be established between Cisco and non-Cisco routers.

The IETF parameter is missing from the frame-relay map ip 10.10.10.1 201 command.

2

Refer to the exhibit.

Communication between two peers has failed. Based on the output that is shown, what is the

most likely cause?

interface reset

unplugged cable

improper LMI type

PPP negotiation failure

3

A technician is talking to a colleague at a rival company and comparing DSL transfer rates

between the two companies. Both companies are in the same city, use the same service provider,

and have the same rate/service plan. What is the explanation for why company 1 reports higher

download speeds than company 2 reports?

Company 1 only uses microfilters at branch locations.

Company 1 has a lower volume of POTS traffic than company 2 has.

Company 2 is located farther from the service provider than company 1 is.

Company 2 shares the connection to the DSLAM with more clients than company 1 shares with.

4

Refer to the exhibit. A network administrator is creating a prototype to verify the new WAN

design. However, the communication between the two routers cannot be established. Based on

the output of the commands, what can be done to solve the problem?

Replace the serial cable .

Replace the WIC on RA.

Configure RA with a clock rate command.

Issue a no shutdown interface command on RB.

5

Refer to the exhibit. Router RT is not receiving routing updates from router RTA. What is

causing the problem?

The ip rip authentication key-chain command specifies exam rather than test.

The name of the keystring is not the name of the neighboring router.

The key chains are given the same name on both routers.

The passive-interface command was issued for RTA.

6

What are two main components of data confidentiality? (Choose two.)

checksum

digital certificates

encapsulation

encryption

hashing

7

Which network component has the primary function of detecting and logging attacks made

against the network?

Cisco Security Agent

antivirus software scanner

intrusion detection system

intrusion prevention system

8

Refer to the exhibit. A network technician has been called in to resolve a problem with this

network segment. The symptoms include a loss of connectivity throughout the network segment,

high link utilization, and syslog messages that indicate constant MAC address relearning. What

is the likely cause of these symptoms?

cable fault

faulty NIC card

IP addressing error

spanning tree problem

NAT configuration error

9

Which variable is permitted or denied by a standard access control list?

protocol type

source IP address

source MAC address

destination IP address

destination MAC address

10

Refer to the exhibit. To reach R2, and for configuring Frame Relay on the point-to-point

interfaces shown in the graphic, which DLCI should be used in the frame-relay interface-dlci

command that is issued on R1?

100

101

200

201

11

A system administrator must provide Internet connectivity for ten hosts in a small remote office.

The ISP has assigned two public IP addresses to this remote office. How can the system

administrator configure the router to provide Internet access to all ten users at the same time?

Configure DHCP and static NAT.

Configure dynamic NAT for ten users.

Configure static NAT for all ten users.

Configure dynamic NAT with overload.

12

Refer to the exhibit. Which two actions are described by the output of the debug ip nat

command? (Choose two.)

A packet from 192.168.1.2 has been translated using NAT overload.

The * indicates that the NAT translation was unsuccessful and the packet was dropped.

A packet from 192.31.7.2 has been translated by NAT and forwarded to a destination address of

198.133.219.2.

A packet from 192.31.7.2 has been sent to 198.133.219.2, which was then translated to the

destination 192.168.1.2

A packet from 192.168.1.2 has been translated by NAT to a source address of 198.133.219.2 and

forwarded to the destination 192.31.7.2.

13

Refer to the exhibit. A technician issues the show interface s0/0/0 command on R1 while

troubleshooting a network problem. What two conclusions can be determined by from the output

shown? (Choose two.)

The bandwidth has been set to the value of a T1 line.

This interface should be configured for PPP encapsulation.

There is no failure indicated in an OSI Layer 1 or Layer 2.

The physical connection between the two routers has failed.

The IP address of S0/0/0 is invalid, given the subnet mask being used.

14

Which Layer 2 access method separates traffic into time slots and is specified by DOCSIS for

use with cable high speed Internet service?

TDMA

FDMA

CDMA

S-CDMA

15

Refer to the exhibit. Which data transmission technology is being represented?

TDM

PPP

HDLC

SLIP

16

Which statement is true about PAP in the authentication of a PPP session?

PAP uses a two-way handshake.

The password is unique and random.

PAP conducts periodic password challenges.

PAP uses MD5 hashing to keep the password secure.

17

What is a common use of a TFTP server?

to allow access to restricted system resources

to detect attacks against a network and send logs to a management console

to provide active defense mechanisms that prevent attacks against the network

to perform IOS image and configuration uploads and downloads over the network

18

Refer to the exhibit. The link between the CTRL and BR_1 routers is configured as shown in the

exhibit. Why are the routers unable to establish a PPP session?

The clock rate must be 56000.

The usernames are misconfigured.

The IP addresses are on different subnets.

The clock rate is configured on the wrong end of the link.

The CHAP passwords must be different on the two routers.

Interface serial 0/0/0 on CTRL must connect to interface serial 0/0/1 on BR_1.

19

What is the result when the command security passwords min-length 8 is entered into a router?

All new passwords are required to be a minimum of 8 characters in length.

All current passwords are now required to be a minimum of 8 characters in length.

Enable passwords must be at least 8 characters but line passwords are unaffected.

Nothing will happen until the command service password-encryption is entered. Then all future

passwords must have a minimum of 8 characters.

20

After troubleshooting a LAN, a network technician has determined that network performance

has been severely impacted by the attenuation of the bit stream. Which physical layer condition

led the technician to this conclusion?

There is an excessive amount of EMI on the physical media.

The amplitude of the physical layer data has been significantly reduced.

There is an open conductor between the endpoints on the physical media.

The maximum allowed clock rate on the physical media has been exceeded.

21

A company is looking for a WAN solution to connect its headquarters site to four remote sites.

What are two advantages that dedicated leased lines provide compared to a shared Frame Relay

solution? (Choose two.)

reduced jitter

reduced costs

reduced latency

the ability to burst above guaranteed bandwidth

the ability to borrow unused bandwidth from the leased lines of other customers

22

Which two statements are true about creating and applying access lists? (Choose two.)

One access list per port, per protocol, per direction is permitted.

Access list entries should filter in the order from general to specific.

Statements are processed sequentially from top to bottom until a match is found.

The term “inbound” refers to traffic entering the network from the router interface where the

ACL is applied.

Standard ACLs should be applied closest to the source while extended ACLs should be applied

closest to the destination.

23

A network technician wants to implement SSH as the means by which a router may be managed

remotely. What are two procedures that the technician should use to successfully complete this

task? (Choose two.)

Configure the login banner.

Configure authentication.

Define the asymmetrical keys.

Configure the console password.

Enter the service password-encryption command.

24

Which two protocols in combination should be used to establish a link with secure authentication

between a Cisco and a non-Cisco router? (Choose two.)

HDLC

PPP

SLIP

PAP

CHAP

25

What will be the result of adding the command ip dhcp excluded-address 192.168.24.1

192.168.24.5 to the configuration of a local router that has been configured as a DHCP server?

Traffic that is destined for 192.168.24.1 and 192.168.24.5 will be dropped by the router.

Traffic will not be routed from clients with addresses between 192.168.24.1 and 192.168.24.5.

The DHCP server will not issue the addresses ranging from 192.168.24.1 to 192.168.24.5.

The router will ignore all traffic that comes from the DHCP servers with addresses 192.168.24.1

and 192.168.24.5.

26

Refer to the exhibit. The network administrator creates a standard access control list to prohibit

traffic from the 192.168.1.0/24 network from reaching the Internet. The access list must still

permit the 192.168.1.0/24 network access to the 192.168.2.0 network. On which router interface

and in which direction should the access control list be applied?

interface Fa0/0, inbound

interface Fa0/0, outbound

interface S0/0/0, inbound

interface S0/0/0, outbound

27

Refer to the exhibit. Which statement is true about the Frame Relay connection?

The Frame Relay connection is in the process of negotiation.

A congestion control mechanism is enabled on the Frame Relay connection.

The “ACTIVE” status of the Frame Relay connection indicates that the network is experiencing

congestion.

Only control FECN and BECN bits are sent over the Frame Relay connection. No data traffic

traverses the link.

28

Refer to the exhibit. Results of the show vlan and show vtp status commands for switches S1 and

S2 are displayed in the exhibit. VLAN 11 was created on S1. Why is VLAN 11 missing from

S2?

There is a Layer 2 loop.

The VTP domain names do not match.

Only one switch can be in server mode.

S2 has a higher spanning-tree priority for VLAN 11 than S1 does.

29

An administrator attempts to telnet into a remote device and receives the error “Password

required but none set”. How can the administrator resolve this issue?

Set the enable secret command on the remote router.

Set the login command on the vty lines on the remote router.

Set the password command on the vty lines on the remote router.

Enable the service password-encryption command on the remote router.

30

Refer to the exhibit. All devices are configured as shown in the exhibit. PC1 is unable to ping the

default gateway. What is the cause of the problem?

The default gateway is in the wrong subnet.

STP has blocked the port that PC1 is connected to.

Port Fa0/2 on S2 is assigned to the wrong VLAN.

S2 has the wrong IP address assigned to the VLAN30 interface.

31

Which additional functionality is available on an interface when the encapsulation is changed

from HDLC to PPP?

flow control

error control

authentication

synchronous communication

32

Refer to the exhibit. A technician is teaching a trainee to interpret the results of various Frame

Relay troubleshooting commands. What conclusion can be drawn from the output that is shown?

Neighboring routers should use DLCI 177 to reach the Branch router.

DLCI 177 will be used to identify all broadcasts that are sent out the Branch router.

The Branch router has the address 192.168.3.1 configured for the S0/0/0 interface.

To reach 192.168.3.1, the Branch router will use the virtual circuit that is identified by DLCI

177.

33

Refer to the exhibit. The corporate network that is shown has been assigned network

172.16.128.0/19 for use at branch office LANs. If VLSM is used, what mask should be used for

addressing hosts at Branch4 with minimal waste from unused addresses?

/19

/20

/21

/22

/23

/24

34

A network administrator uses the 3DES algorithm to encrypt traffic that crosses a VPN. Which

VPN characteristic is being configured?

authentication

authorization

data integrity

data confidentiality

35

Which statement is true about wildcard masks?

A wildcard mask must be created by inverting the subnet mask.

A wildcard mask performs the same function as a subnet mask.

A wildcard mask of 0.0.0.0 means the address should match exactly.

A wildcard mask uses a “1″ to identify IP address bits that must be checked.

36

Refer to the exhibit. What statement is true about the core router devices?

They use multiport internetworking devices to switch traffic such as Frame Relay, ATM, or X.25

over the WAN.

They provide internetworking and WAN access interface ports that are used to connect to the

service provider network.

They provide termination for the digital signal and ensure connection integrity through error

correction and line monitoring.

They support multiple telecommunications interfaces of the highest speed and are able to

forward IP packets at full speed on all of those interfaces.

37

When NAT is in use, what is used to determine the addresses that can be translated on a Cisco

router?

access control list

routing protocol

inbound interface

ARP cache

38

A network administrator is instructing a technician on best practices for applying ACLs. Which

suggestion should the administrator provide?

Named ACLs are less efficient than numbered ACLs.

Standard ACLs should be applied closest to the core layer.

ACLs applied to outbound interfaces are the most efficient.

Extended ACLs should be applied closest to the source that is specified by the ACL.

39

Which IP address and wildcard mask combination can be used in an ACL statement to match the

172.16.0.0/30 network?

172.16.0.0 0.0.0.1

172.16.0.0 0.0.0.3

172.16.0.0 0.0.0.7

172.16.0.0 255.255.255.252

40

When configuring a Frame Relay connection, what is the purpose of Inverse ARP?

to assign a DLCI to a remote peer

to disable peer requests from determining local Layer 3 addresses

to negotiate LMI encapsulations between local and remote Frame Relay peers

to create a mapping of DLCI to Layer 3 addresses that belong to remote peers

41

Which security solution has the responsibility of monitoring suspicious processes that are

running on a host and that might indicate infection of Trojan horse applications?

antivirus application

operating system patches

intrusion prevention system

Cisco Adaptive Security Appliance

42

What is the function of an intrusion detection system on a network?

to restrict access to only authorized users

to detect attacks against a network and send logs to a management console

to prevents attack against the network and provide active defense mechanisms

to detect and prevent most viruses and many Trojan horse applications from spreading in the

network

43

Which statement about a VPN is true?

VPN link establishment and maintenance is provided by LCP.

DLCI addresses are used to identify each end of the VPN tunnel.

VPNs use virtual Layer 3 connections that are routed through the Internet.

Only IP packets can be encapsulated by a VPN for tunneling through the Internet.

44

An administrator learns of an e-mail that has been received by a number of users in the company.

This e-mail appears to come from the office of the administrator. The e-mail asks the users to

confirm their account and password information. Which type of security threat does this e-mail

represent?

cracking

phishing

phreaking

spamming

45

Refer to the exhibit. An ACL called Managers already exists on this router. What happens if the

network administrator issues the commands as shown in the exhibit?

The commands are added to the end of the existing ACL.

The existing Managers ACL will be overwritten by the new ACL.

The router will output an error message and no changes will be made.

A duplicate Managers ACL will be created that will contain only the new commands.

46

Which encapsulation protocol when deployed on a Cisco router over a serial interface is only

compatible with another Cisco router?

PPP

SLIP

HDLC

Frame Relay

47

What name is given to the location where a customer network interfaces with a network that is

owned by another organization?

CPE

DCE

local loop

demarcation point

48

Refer to the exhibit. Which option displays the correct ACL that would need to be applied

inbound on the S0/0/0 interface on R2 in order to permit any type of network traffic and block all

FTP traffic coming from hosts on the 172.16.10.0/24 network going to the Internet?

49

Refer to the exhibit. A network administrator is trying to backup the IOS software on R1 to the

TFTP server. He receives the error message that is shown in the exhibit, and cannot ping the

TFTP server from R1. What is an action that can help to isolate this problem?

Use correct source file name in the command.

Verify that the TFTP server software is running.

Make sure that there is enough room on the TFTP server for the backup.

Check that R1 has a route to the network where the TFTP server resides.

50

A network administrator has changed the VLAN configurations on his network switches over the

past weekend. How can the administrator determine if the additions and changes improved

performance and availability on the company intranet?

Conduct a performance test and compare with the baseline that was established previously.

Interview departmental secretaries and determine if they think load time for web pages has

improved.

Determine performance on the intranet by monitoring load times of company web pages from

remote sites.

Compare the hit counts on the company web server for the current week to the values that were

recorded in previous weeks.

51

Which characteristic of VPN technology prevents the contents of data communications from

being read by unauthorized parties?

QoS

latency

reliability

confidentiality

52

Which configuration on the vty lines provides the best security measure for network

administrators to remotely access the core routers at headquarters?