CCNA 4 Final Exam Version 3.1

This test is 100%. I have the master key in front of me.

1 Refer to the exhibit. A network administrator is checking the status of the router
CTL-1. What is the most likely reason for the current state of the serial link to CTL-2?

The circuit is suffering from excessive RFI.
Authentication is not properly configured on the routers.
The routers are configured for different WAN encapsulations.
The clock rate is not properly configured on one of the routers.
A cable has become disconnected. *



2 While prototyping an internetwork in the corporate lab, a network administrator is testing a serial link between serial 0/0 interfaces on two routers. The labels on the serial cable ends have been damaged and are unreadable. What command can be issued to determine which router is connected to the DCE cable end?

show interfaces serial 0/0
show version
show controllers serial 0/0 *
show protocols serial 0/0
show status serial 0/0



3 Where in the network does the responsibility of the service provider end? (Choose three.)

at the demarcation point *
between the customer’s local-area networks
outside of the United States, on the customer side of the network terminating unit (NTU) *
at the service provider’s cetral office
in the United States, the connection of the customer-provided equipment and the local loop *
at the point in the network where NAT occurs



4 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 for all ten users.
Configure dynamic NAT for ten users.
Configure dynamic NAT with PAT.*
Configure DHCP and static NAT.
What the administrator wants to do cannot be done.




5 Refer to the exhibit. A system administrator is unable to ping the S0 interface of the West router from the East router. During the troubleshooting process, the following facts are established:

- IP addressing and subnet masks are correct.
- East is a Cisco router and West is a router from another vendor.

What should the administrator do to solve the problem?

Enable the serial interface on West
Change the encapsulation on both routers to PPP. *
Add a clock rate on East.
Replace the serial cable used to attach the CSU/DSU to West.
Set the loopback interface on East



6 A network administrator must provide WAN connectivity between a central office and three remote sites: Orlando, Atlanta, and Phoenix. The Orlando and Atlanta remote offices receive sales orders and transmit shipping confirmations to the Central office consistently throughout the day. The Phoenix remote office consists of one salesperson traveling through the southwest territory. The salesperson occasionally needs to connect to the Central office for e-mail access. How should the network administrator connect the remote sites to the Central office? (Choose two.)

Connect to the Atlanta and Orlando remote offices with Frame Relay connections. *
Connect to the Atlanta and Orlando remote offices with ISDN connections.
Connect to the Atlanta and Orlando remote offices with POTS dial-up connections.
Connect to the Phoenix remote office with a Frame Relay connection.
Connect to the Phoenix remote office with a POTS dial-up connection. *



7 A system administrator needs to configure the regional office with ISDN for DDR connections to three remote sites. Each remote site requires different IP subnets, different encapsulations, and different authentication methods. The sites will not be connected at the same time. The company would like to accomplish this in the most cost effective manner. What method can the system administrator use to accomplish this task using the fewest B channels?

Install and configure a PRI.
Install and configure a BRI interface with separate SPIDs for each remote site.
Install and configure a BRI with multiple switch types in global configuration.
Install and configure a BRI using dialer profiles. *
Install and configure a separate BRI for each remote site.



8 A network administrator is having difficulty in establishing a serial link between a Cisco router and a router from another vendor. Both routers are configured for HDLC encapsulation. Which statements are true regarding this configuration? (Choose two.)

The Cisco HDLC frame uses a proprietary "Type" field that may not be compatible with equipment of other vendors. *
HDLC requires a clock rate to be configured on the routers at both ends of the serial link.
PPP encapsulation is recommended for serial links between equipment from multiple vendors. *
Usernames must be configured at both ends of the HDLC serial link.
The HDLC vendor type must be enabled on the Cisco router.
There is a mismatch in the HDLC authentication password configurations.



9 Which of the following is the order for the three phases of establishing a PPP serial link with authentication?

authentication, link-establishment, network layer protocols
authentication, network layer protocols, link-establishment
network layer protocols, link-establishment, authentication
network layer protocols, authentication, link-establishment
link-establishment, authentication, network layer protocols *
link-establishment, network layer protocols, authentication



10 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 CHAP passwords must be different on the two routers.
The clock rate must be 56000.
Interface serial 0/0 on CTRL must connect to interface serial 0/1 on BR_1.
The IP addresses are on different subnets.
The usernames are misconfigured. *
The clock rate is configured on the wrong end of the link.



11 The serial PPP link between the Left and Right routers is configured as shown in the diagram. Which configuration issue will prevent IP traffic from crossing this link?

The passwords must be different for the CHAP authentication.
The usernames are misconfigured.
The clock rate must be 56000.
The clock rate is configured on the wrong end of the link.
The IP addresses must be on the same subnet. *
Interface serial 0/0 on Left must connect to interface serial 0/1 on Right.



12 A technician enters the interface serial 0/0.1 multipoint command when configuring a router. What effect will the multipoint keyword have in this configuration? (Choose two.)

Split-horizon issues will need to be resolved for this network if RIP is the routing protocol. *
A subinterface will be defined for each PVC.
All the participating interfaces of remote routers will be configured in the same subnet. *
A single DLCI will be used to define all the PVCs to the remote routers.
An IP address will need to be configured on the main interface.



13 Refer to the exhibit. A technician is configuring router Corp-1 to connect to router Corp-2 across the network shown in the graphic. Which router command will associate a Layer 2 address with the corresponding Layer 3 address in order to provide connectivity between the two routers?

Corp-1(config-if)# dialer-map ip 198.18.10.249 205 broadcast
Corp-1(config-if)# dialer-map 198.18.10.249 105 serial 0 broadcast
Corp-1(config-if)# dialer-map 198.18.10.250 inverse-arp broadcast
Corp-1(config-if)# frame-relay pvc 205 198.18.10.250
Corp-1(config-if)# frame-relay map ip 198.18.10.250 205 broadcast *
Corp-1(config-if)# frame-relay dlci 105 198.18.10.249 broadcast



14 Two routers are connected through a Frame Relay, point-to-point PVC. The remote router is from a vendor other than Cisco. Which interface command is required to configure the link between the Cisco router and the other router?

frame-relay pvc multipoint
frame-relay pvc point-to-point
encapsulation frame-relay cisco
encapsulation frame-relay ietf *
frame-relay lmi-type ansi



15 The command show frame-relay map give the following output”

Serial 0 (up): ip 192.168.151.4 dlci 122, dynamic, broadcast, status defined, active

Which statements represent what is show?(Choose two.)

192.168.151.4 represents the IP address of the remote router *
192.168.151.4 represents the IP address of the local serial interface.
DLCI 122 represents the interface of the remote serial interface
DLCI 122 represents the local number used to connect to the remote address *
broadcast indicates that a dynamic routing protocol such as RIP v1 can send packets accress this PVC.
active indicates that the ARP process is working




16 The output of the show interfaces serial 0/0 command for a frame-relay connection indicates that the serial line is up but the line protocol is down. What are possible causes for this? (Choose two.)

There is an LMI-type mismatch between the Frame Relay switch and the router. *
There is no clock present on the serial interface. *
The interface is shut down.
RARP is not functioning on the router.
The cable is disconnected.



17 What can be done to Frame Relay to resolve split-horizon issues? (Choose two.)

Disable inverse ARP.
Create a full-mesh topology. *
Develop multipoint subinterfaces.
Configure point-to-point subinterfaces. *
Remove the broadcast keyword from the frame-relay map command



18 What does the status inactive indicate in the output of the show frame-relay pvc command?

The DLCI is programmed in the switch but is not usable. *
The DLCI was formerly programmed in the switch but is no longer there.
The DLCI is usable but has little activity.
The DLCI has been renamed for that PVC.



19 What can occur when a Frame Relay switch detects its queue filling faster than it can process data? (Choose two.)

Frame in excess of the CIR are not accepted by the switch.
Frames with the DE bit set are dropped from the switch queue. *
Frames with the FECN and BECN bit are dropped from the switch queue.
The switch sets the FECN bit on all frames it receives on the congested link and sets the BECN bit on all frames it places on the congested link. *
The switch sets the FECN bit on all frames it places on the congested link and sets the BECN bit on all frames it receives on the congested link.





20 Which of the following are valid steps for a basic ISDN BRI configuration? (Choose two.)

create subinterfaces
define the LMI type
set the SPIDs if required by the ISDN switch *
set the interface DLCI
set the switch type *
specify the encapsulation as either Cisco or IETF



21 After the ISDN BRI interface is configured, which command can be used to verify that the router is communicating correctly with the ISDN switch?

show dialer
show isdn status *
show interfaces bri0/0:1
show interfaces serial0/0.1



22 Which ISDN protocol is specifies the data-link processes of LAP?

ITU-T I.430
ITU-T I.431
ITU-T Q.921 *
ITU-T Q.931



23 Which protocol should be chosen to support WAN connectivity in a multi-vendor system and provide strong security through authentication?

NAT with DHCP
Frame Relay
HDLC with encryption
HDLC with CHAP
PPP with PAP
PPP with CHAP *



24 Which of the following describes 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.



25 When configuring a Frame Relay connection, when should a static Frame Relay map be used? (Choose two.)

when the remote router is a non-Cisco router
when the remote router does not support Inverse ARP *
when the local router is using IOS Release 11.1 or earlier
when broadcast traffic and multicast traffic over the PVC must be controlled *
when globally significant rather than locally significant DLCIs are being used



26 The exhibit represents steps to initiate a DDR call. Which option lists the steps in the proper order?

1,3,2,4
2,3,1,4
2,3,4,1 *
3,4,1,2
4,1,3,2
4,2,3,1

1 - call is made
2 - route to destination is determined
3 - interesting traffic triggers DDR
4 - dial number is looked up


27 What causes a DDR call to be placed?

dial string
DLCI
idle time out
interesting traffic *
PVC




28 After configuring a dialup ISDN circuit, a network associate begins testing the dialup connection. When attempting to ping a host on the remote network, the local router does not attempt to dial the remote access server. Which of the following are possible errors in this configuration? (Choose three.)

PPP authentication is not properly configured.
No dialer map is configured. *
The ISDN circuit connected to the remote access server is busy.
No interesting traffic is defined. *
No route is determined to the remote network. *
A wrong number is configured in the dial string.



29 A branch office reports excessive connect time charges for an ISDN circuit used to connect to the regional office. Upon investigation of this issue, it is discovered that when an ISDN connection is initiated to the regional office it remains connected for an excessive amount of time. Which of the following configuration changes could be made to DDR on the router to reduce these connect time charges?

use PPP multilink
lower idle timer setting *
use CHAP authentication
change DDR from legacy to dialer profiles



30 An ISDN circuit from a branch office is remaining connected to the regional office. A network administrator determines a user has initiated a continuous ping from a desktop computer to the regional office. Which configuration change would allow the ISDN circuit to disconnect during any attempts to ping, while otherwise functioning properly?

change DDR from legacy to dialer profiles
remove the dialer list statement from the configuration
change the dialer list to exclude ICMP as interesting *
disable inverse ARP



31 What value in the address field of a Frame Relay header identifies the destination of the frame?

CIR
DE
DLCI *
ISDN
FRAD
PVC




Oneonta#show running-config
--- output omitted ---
ip dhcp excluded-address 192.168.123.1 192.168.123.10
!
ip dhcp pool MGRs-hosts
network 192.168.123.0 255.255.255.0
dns-server 192.168.123.3 172.16.1.3
!
Interface FastEthernet0/0
Ip address 192.168.123.1 255.255.255.0











32 A network technician determines DHCP clients are not working properly. The clients are receiving IP configuration information from a DHCP server configured on the router but cannot access the Internet. From the output in the graphic, what is the most likely problem?

The DHCP server service is not enabled.
The inside interface for DCHP is not defined.
The DHCP pool is not bound to the interface.
The pool does not have a default router defined for the clients. *
All the host addresses have been excluded from the DHCP pool.



33 Which WAN Technology is built on a sell-based rather than a frame-based architecture?

ISDN
Frame Relay
X.25
ATM *



34 A system administrator is troubleshooting a connectivity issue between two routers in a new installation. The administrator enters the debug ppp authentication command on the WHSE router. The graphic shows a part of the output received. From this output, what is the most likely cause of this connectivity issue?

There is not a route to the remote router.
The ISDN circuit on the remote router has failed.
The username/password was not properly configured on the WHSE router.*
The remote router has a different authentication protocol configured.


35 Which of the following IP addresses are defined by rfc 1918 as private addresses? (Choose three.)

192.168.146.0/22 *
172.10.25.0/16
172.31.0.0/16 *
20.0.0.0/8
10.172.92.8/29 *



36 What functionality do access control lists provide when implementing dynamic NAT on Cisco router?

Defines which addresses are excluded from the NAT pool
Defines which addresses are assigned to a NAT pool
Defines which addresses are allowed out of the router
Defines which addresses can be translated *




37 Given the partial router configuration in the graphic, why does the workstation with the IP address 192.168.1.153/28 fail to access the Internet? (Choose two.)

The NAT inside interfaces are not configured properly. *
The NAT outside interface is not configured properly.
The router is not properly configured to use the access control list for NAT. *
The NAT pool is not properly configured to use routable outside addresses.
The access control list does not include the IP address 192.168.1.153/28 to access the Internet.



38 Which statements describe NAT? (Choose two.)

Nat hides the internal IP addressing structure from untrusted networks and conserves routable addresses. *
Only one pool of routable addresses can be assigned per router interface.
Nat can cause applications that depend on addressing, rather than domain names, to fail to function properly. *
Cisco IOS NAT supports important protocols such as ICMP, FTP, BOOTP, and SNMP.
When using dynamic NAT, the number of hosts that can access the outside network is limited to the number of private addresses in the NAT pool.




39 How are the settings for ISDN switch types and SPIDs determined for a BRI interfaces configuration?

assigned by the network administrator
randomly, so long as they are not duplicated on the network
by trail and error
dynamically via Inverse ARP
assigned by IANA
assigned by the service provider *



40 When configuring a Frame Relay network with subinterfaces, which commands are configured on the subinterface? (Choose three.)

frame-realy interface-dlvi *
encapsulation frame-relay ietf
ip address *
frame-relay map *
switch type