EWAN Practice Final Exam

EWAN Practice Final Exam

1 Which address provides an example of an IPv6 link-local address?

FE80::1324:ABCD

2001:2345:AB12:1935::FEFF

2001:1234:0000:9CA::0876/64

1234:ABCD:5678:EF00:9234:AA22:5527:FC35

Observable Description Max Value

1 correctness of response 2 points for Option 1

0 points for any other option 2

This item references content from the following areas:

CCNA Exploration: Accessing the WAN

7.3.2 IPv6 Addressing

2 While configuring a router using RIPng and dual-stack technology with

IPv4 and IPv6, the administrator receives an error message when

inputting IPv4 routes. What could cause the error message?

IPv4 is not compatible with RIPng

RIPng is incompatible with dual-stack technology.

The router interfaces have been configured with incorrect addresses.

When IPv4 and IPv6 are configured on the same interface, all IPv4

addresses are shut down in favor of the newer technology.






7.3.6 Routing Considerations with IPv6

3 Which statement is true about an interface that is configured with the

IPv6 address command?

IPv6 traffic-forwarding is enabled on the interface.

A link-local IPv6 address is automatically configured on the interface.

A global unicast IPv6 address is dynamically configured the interface.

Any IPv4 addresses that are assigned to the interface are replaced with

an IPv6 address.






7.3.7 Configuring IPv6 Addresses

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

address 172.16.4.1 172.16.4.5 to the configuration of a local router that

has been configured as a DHCP server?

Traffic that is destined for 172.16.4.1 and 172.16.4.5 will be dropped by

the router.

Traffic will not be routed from clients with addresses between 172.16.4.1

and 172.16.4.5.

The DHCP server function of the router will not issue the addresses

between 172.16.4.1 and 172.16.4.5.

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

addresses 172.16.4.1 and 172.16.4.5.






7.1.4 Configuring a DHCP Server

5

Refer to the exhibit. A host that is connected to Fa0/0 is unable to acquire

an IP address dynamically from the DHCP server. The output of the

debug ip dhcp server command shows "DHCPD: there is no address pool

for 172.16.1.1". What is the problem?

The default router for the 172Network pool is incorrect.

The 172.16.1.1 address is already configured on Fa0/0.

The pool of addresses for the 172Network pool is incorrect.

The ip helper-address command should be implemented on the Fa0/0

interface.






7.1.8 Troubleshooting DHCP

6 What does an access control list determine when used with NAT on a

Cisco router?

addresses that are to be translated

addresses that are assigned to a NAT pool

addresses that are allowed out of the router

addresses that are accessible from the inside network






7.2.5 Configuring Dynamic NAT

7 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 static NAT.

Configure dynamic NAT.

Configure static NAT with overload.

Configure dynamic NAT with overload.






7.2.6 Configuring NAT Overload

8 What three statements describe the roles of devices in a WAN? (Choose

three.)

A CSU/DSU terminates a digital local loop.

A modem terminates a digital local loop.

A CSU/DSU terminates an analog local loop.

A modem terminates an analog local loop.

A router is commonly considered a DTE device.

A router is commonly considered a DCE device.


1 correctness of response Option 1, Option 4, and Option 5 are correct.

1 point for each correct option.

0 points if more options are selected than required. 3



1.2.2 WAN Physical Layer Concepts

9 At what physical location does the responsibility for a WAN connection

change from the service provider to the user?

DMZ

local loop

CSU/DSU

demarcation point






2.1.3 Demarcation Point

10

Refer to the exhibit. Which statement is true about the WAN switch

device?

It uses a multiport internetworking device to switch traffic such as Frame

Relay, ATM or X.25 over the WAN.

It provides internetworking and WAN access interface ports that are used

to connect to the service provider network.

It provides termination for the digital signal and ensures connection

integrity through error correction and line monitoring.

It converts the digital signals produced by a computer into voice

frequencies that can be transmitted over the analog lines of the public

telephone network.






1.2.2 WAN Physical Layer Concepts

11

Refer to the exhibit. A network administrator is using two routers to test

a WAN connection . What can be concluded based on the output of the

show running-config commands?

The WAN link is using PPP encapsulation.

The WAN link speed is faster than a T1 line.

The router R2 serves as the DCE for the WAN link.

The WAN link is configured with the Cisco default encapsulation protocol.






2.1.5 HDLC Encapsulation

12 Which important piece of troubleshooting information can be

discovered about a serial interface using the show controllers command?

queuing strategy

serial cable type

interface IP address

encapsulation method






2.1.7 Troubleshooting a Serial Interface

13 Which combination of Layer 2 protocol and authentication should be

used to establish a link between a Cisco and a non-Cisco router without

sending authentication information in plain text?

HDLC with PAP

HDLC with CHAP

PPP with PAP

PPP with CHAP






2.4.1 PPP Authentication Protocols

2.4.3 Challenge Handshake Authentication Protocol (CHAP)

14 Which three items are LCP options that can be configured for PPP?

(Choose three.)

CHAP

Stacker

IPCP

CDPCP

Multilink


1 correctness of response Option 1, Option 2, and Option 5 are correct.





2.2.5 Establishing a Link with LCP

15 At what point in the PPP connection process does the authentication

phase occur?

after NCP establishes Layer 3 parameters

before LCP begins the link establishment process

after the initial Configure-Request message from the link initiator

after the link initiator receives a Configure-Ack message from the

responder






2.2.5 Establishing a Link with LCP

16

Refer to the exhibit. Why are the routers unable to establish a PPP

session?

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 Router1 must connect to interface serial 0/0/1 on

Router2.






2.4.5 Configuring PPP with Authentication

17

Refer to the exhibit. What would be the result of entering the exhibited

configuration on a Frame Relay router?

The local interface DLCI will be set to 102.

All traffic that is destined to 172.16.16.8 will be sent as broadcast.

Only broadcast traffic will be recieved on the Frame Relay interface.

Routing protocol multicast updates can be forwarded across the Frame

Relay PVC.






3.2.2 Configuring Static Frame Relay Maps

18

Refer to the exhibit. What is placed in the address field in the header of a

frame that will travel from the DC office of ABC Company to the Orlando

office?

MAC address of the Orlando router

MAC address of the DC router

192.168.1.25

192.168.1.26

DLCI 100

DLCI 200






3.1.3 Frame Relay Encapsulation

19 A company uses a PVC with a committed information rate (CIR) of 128

kb/s and a committed burst information rate (CBIR) of 64 kb/s. The link is

used to periodically send updates at a rate of 144 kb/s. What will happen

to the update traffic?

The traffic will be sent, but the company will be charged a penalty.

The traffic will be sent using the additional CBIR and will be guaranteed

delivery.

The traffic will be dropped at the CO for exceeding the committed

information rate.

The traffic will be sent, but the burst traffic will be marked for discard if

congestion is encountered.






3.3.2 Paying for Frame Relay

20 Which two functions are provided by the Local Management Interface

(LMI) that is used in Frame Relay networks? (Choose two.)

flow control

error notification

congestion notification

the mapping of DLCIs to network addresses

the sending of keepalive packets to verify operation of the PVC


1 correctness of response Option 1 and Option 5 are correct.





3.1.5 Frame Relay Address Mapping

21

Refer to the exhibit. You are a network administrator who has been

tasked with completing the Frame Relay topology that interconnects two

remote sites. How should the point-to-point subinterfaces be configured

on HQ to complete the topology?

HQ(config-subif)#frame-relay interface-dlci 103 on Serial 0/0/0.1



HQ(config-subif)# frame-relay interface-dlci 302 on Serial 0/0/0.2

HQ(config-subif)#frame-relay map ip 172.16.1.1 103 broadcast on Serial

0/0/0.1


0/0/0.2


0/0/0.1


0/0/0.2






3.4.1 Configuring Frame Relay Subinterfaces

22

Refer to the exhibit. Branch A has a Cisco router. Branch B has a non-

Cisco router set for IETF encapsulation. After the commands shown are

entered, R2 and R3 fail to establish the PVC. The R2 LMI is Cisco, and the

R3 LMI is ANSI. The LMI is successfully established at both locations.

Why is the PVC failing?

The PVC to R3 must be point-to-point.

LMI types must match on each end of a PVC.

The ietf parameter is missing from the frame-relay map ip 10.10.10.3 203

command.

The PVCs at R2 use different encapsulation types. A single port can only

support one encapsulation type.







23

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.







24

Refer to the exhibit. Which statement is true about the status of the

Frame Relay connection?

The Frame Relay connection is in the process of negotiation.

Only packets with control bit DE set are sent over the PVC. No data

traffic traverses the link.

Packets marked as FECN and BECN indicate that a congestion control

mechanism is enabled on the Frame Relay PVC.

The “DLCI USAGE = LOCAL” status indicates that the PVC link is not

established between the interface S0/0/0.1 and the Frame Relay switch.






3.3.3 Frame Relay Flow Control

25 Which wireless solution can provide mobile users with non line-of-

sight broadband Internet access at speeds comparable to DSL or cable?

Wi-Fi

WiMAX

satellite

Metro Ethernet






1.3.5 Internet Connection Options

26 What are two characteristics of DSL technology? (Choose two.)

Uploads typically offer larger transfer rates than downloads.

Service providers deploy DSL in the local loop of the telephone network.

DSL download rates are reduced by large volumes of POTS voice traffic.

Filters and splitters allow POTS and DSL traffic to share the same

medium.

DSL is a shared medium that allows many users to share bandwidth

available from the DSLAM.







6.2.3 DSL

27

Refer to the exhibit. A packet is being sent from Host A to Host B through

the VPN tunnel between R1 and R3. When the packet first arrives at R3,

what are the source and destination IP addresses of the packet?

Source 192.168.1.2 - Destination 192.168.4.2









6.3.5 VPN Tunneling

28 What is a major characteristic of a worm?

malicious software that copies itself into other executable programs

tricks users into running the infected software

a set of computer instructions that lies dormant until triggered by a

specific event

exploits vulnerabilities with the intent of propagating itself across a

network






4.1.3 Types of Network Attacks

29 What is the function of an IDS?

to report the attack after it happens

to stop the attack prior to its completion

to quarantine the virus or worm so as not to infect any other host

to reconfigure the security policy of a firewall to prevent another attack






4.1.4 General Mitigation Techniques

30 When configuring remote access to a router, what is the significance

of the no password command on a VTY line?

Logins are prevented on that line.

No password is required to log in to that line.

The remote user is not allowed to change the password for that line.

The remote user is prompted to change the line password after

connecting to the router.






4.2.4 Securing Remote Administrative Access to Routers

31 What will be the result of the enable secret command when added at

the global configuration mode on the router?

It will use MD5 encryption to protect the privileged EXEC level access.

It will use type 7 encryption and will encrypt only the privileged EXEC

level passwords.

It will use type 7 encryption to prevent all passwords that are displayed

on the screen from being readable.

It will use MD5 encryption to protect the passwords that are only used in

the PAP and CHAP authentication process.






4.2.3 Manage Router Security

32

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

action can help to isolate this problem?

Check that R1 has a route to the 10.10.10.0 network.

Verify that the TFTP server software supports binary file transfers.

Make sure that the TFTP server has 192.168.1.1 as its default gateway.

Ensure that the laptop has an IP address in the 192.168.1.0/24 network.






4.5.4 Backing up and Upgrading Software Image

33 A network technician accidentally deleted the IOS image from flash

and rebooted the router. Which two options can be used to restore the

IOS image? (Choose two.)

Perform a system restore through SDM.

Download the image from a TFTP server through a network connection.

Download the image from a TFTP server through a console connection.

Establish an FTP session through an SSH connection for the image

download.

Use the Xmodem protocol to download the image through a console

connection.







4.5.5 Recovering Software Images

34

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 192.168.2.0/24 network while still permitting Internet

access for all networks. On which router interface and in which direction

should it be applied?

interface fa0/0/0, inbound

interface fa0/0/0, outbound

interface fa0/0/1, inbound

interface fa0/0/1, outbound






5.1.8 Where to Place ACLs

35 What effect would the Router1(config-ext-nacl)# permit tcp 172.16.4.0

0.0.0.255 any eq www command have when implemented inbound on the

f0/0 interface?

All TCP traffic is permitted, and all other traffic is denied.

The command is rejected by the router because it is incomplete.

All traffic from 172.16.4.0/24 is permitted anywhere on any port.

Traffic originating from 172.16.4.0/24 is permitted to all TCP port 80

destinations.






5.3.4 Creating Named Extended ACLs

36

Refer to the exhibit. Which two statements correctly describe how

Router1 processes an FTP request that enters interface S0/0/0 and is

destined for an FTP server at IP address 192.168.1.5? (Choose two.)

The packet does not match an access list condition.

The router matches the incoming packet to the statement that is created

from the access-list 201 permit ip any any command.


from the access-list 101 permit ip any 192.168.1.0 0.0.0.255 command.


from the access-list 201 deny icmp 192.168.1.0 0.0.0.255 any command.

The packet is allowed into Router1.







5.1.4 ACL Operation

37

Refer to the exhibit. An ACL numbered 101 already exists on this router.

What happens if the network administrator issues the commands that are

shown in the exhibit?

The new ACL overwrites the existing ACL.

The network administrator will receive an error message.

The existing ACL is modified to include the new commands.

A second ACL that is numbered 101 is created and contains only the new

commands.






5.2.5 Editing Numbered ACLs

38

Refer to the exhibit. What is the effect of the extended ACL when applied

inbound on the S0/0/0 interface on R2?

All IP traffic will be permitted during the specified days and time range.

Both IP and Telnet traffic will be permitted during the specified days and

time range.

Only Telnet traffic destined for 172.16.10.0/24 will be permitted during

the specified days and time range.

Telnet traffic will be permitted only during the specified days and time

range. All other network traffic will be permitted any time.






5.4.4 Time-based ACLs

39 Which wildcard mask would specify all IP addresses from 192.168.8.0

through 192.168.15.255?

0.0.0.7

0.0.7.255

0.0.8.255

0.0.15.255

0.0.255.255






5.2.3 ACL Wildcard Masking

40

Refer to the exhibit. The SSH connections between the remote user and

the server are failing. The correct configuration of NAT has been verified.

What is the most likely cause of the problem?

SSH is unable to pass through NAT.

There are incorrect access control list entries.

The access list has the incorrect port number for SSH.

The ip helper command is required on S0/0/0 to allow inbound

connections.






8.4.5 Transport Layer Troubleshooting

41 A network administrator added two switches and a new VLAN over the

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

changes improved performance and availability on the company intranet?

Perform a baseline test and compare the current values to values that

were obtained in previous weeks.

Interview departmental secretaries and determine if they think load time

for web pages is improved.

Compare the hit counts on the company web server for the current week

to the values that were recorded from previous weeks.

Performance on the intranet can be determined by monitoring load times

of company web pages from remote sites.






8.1.3 Why is Establishing a Network Baseline Important?

42 A company has its headquarters office in Dallas and five branch offices

located in New York, Chicago, Los Angeles, Seattle, and Atlanta. WAN

links are used for communications among offices in six sites. In planning

the WAN links, the network designer is given two requirements: (1)

minimize cost and (2) provide a certain level of WAN link reliability with

redundant links. Which topology should the network designer

recommend?

star

full mesh

hierarchical

partial mesh






8.3.4 WAN Topology Considerations

43

Refer to the exhibit. Router1 and Router2 each support separate areas of

a data center, and are connected via a crossover cable. Resources

attached to Router1 are unable to connect to resources attached to

Router2. What is the likely cause?

The crossover cable is faulty.

The IP addressing is incorrect.

There is a Layer 2 problem with the router connection.

The upper layers are experiencing an unspecified problem.

One or both of the Ethernet interfaces are not working correctly.






8.4.4 Network Layer Troubleshooting

44 An administrator is unable to receive e-mail. While troubleshooting the

problem, the administrator is able to ping the local mail server IP address

successfully from a remote network and can successfully resolve the mail

server name to an IP address via the use of the nslookup command. At

what layer of the OSI model is the problem most likely to be found?

application

transport

network

data link






8.4.6 Application Layer Troubleshooting

45

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






8.4.3 Data Link Layer Troubleshooting

46

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. VLSM is

not being used. Which subnet mask will allow the most efficient

utilization of IP addresses?

/21

/22

/23

/24

/25

/26






8.5.3 Troubleshooting Enterprise Networks 3

47

Refer to the exhibit. Which VLAN will carry untagged traffic on

FastEthernet 0/1?

VLAN 1

VLAN 2

VLAN 11

VLAN 12

VLAN 30

VLAN 999







48

Refer to the exhibit. In the partial router configuration that is shown,

what is the purpose of access list BLOCK_XYZ?

to prevent source IP address spoofing by hosts on the Fa0/0 LAN

to block access by Fa0/0 LAN hosts to all network services beyond the

router

to prevent users on the Fa0/0 LAN from opening Telnet sessions on the

router

to secure Fa0/0 hosts by allowing only locally sourced traffic into the

Fa0/0 LAN






5.2.6 Creating Standard Named ACLs

49

Refer to the exhibit. Routers R1 and R2 are both configured for single

area OSPF. Users who are connected to switch S1 are unable to access

database applications that run on servers that are connected to S2. The

network engineer is working remotely and only has the information that

is shown in the exhibit to direct initial troubleshooting efforts. Based on

the exhibit, which OSI layer is the most appropriate to start with for a

divide-and-conquer approach?

network layer

application layer

data-link layer

physical layer







50

Refer to the exhibit. An administrator has added the exhibited commands

to routers A and B, but no routing updates are exchanged between the

two routers. Based on the information that is given, what is the likely

cause of the problem?

Router A is advertising the wrong network.

The authentication key strings do not match.

The serial interfaces of routers A and B are not on the same network.

The authentication key numbers do not match the EIGRP process number

for both routers.






4.3.2 Securing Routing Protocols

EWAN Practice Final Exam

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