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Cisco CCNA 4 Final Exam answer

Cisco CCNA 4 Final Exam answer

1. Which of the following describes the roles of devices in a WAN?
A CSU/DSU terminates a digital local loop.
A modem terminates an analog local loop.
A router is commonly considered a DTE device.

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

3. The serial PPP link between the Left and Right routers is configured as shown in the diagram. Which configuration issue explains why the link is unable to establish a PPP session?
The usernames are misconfigured.

4. 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.) (2 / 5)
There is an LMI-type mismatch between the Frame Relay switch and the router.
The cable is disconnected.

5. Which statements are correct about the point in the network where the responsibility of the service provider ends?
The International point is on the customer side of the network terminating unit(NTU).
The United States point is at the interface of the customer-provided equipment and the local loop.
The point is called the demarcation point.

6. 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 controllers serial 0/0

7. 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 pool is not bound to the interface.

8. 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?
Split-horizon issues will need to be resolved for this network if RIP is the routing protocol.
All the participating interfaces of remote routers will be configured in the same subnet.

9. When configuring a Frame Relay connection, when should a static Frame Relay map be used?
when the remote router does not support Inverse ARP
when broadcast traffic and multicast traffic over the PVC must be controlled

10. Which router command would be used to associate a Layer 2 address with the corresponding Layer 3 address in the internetwork in the diagram?
RouterA(config-if)#frame-relay map ip 100 broadcast

11. Which of the following ISDN protocols is responsible for call setup and call teardown?
ITU-T Q.921

12. What are two ways to resolve split-horizon issues in a Frame Relay network? (Choose two.) (2 / 5)
create a full-mesh topology
use point-to-point subinterfaces

13. What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco 806 broadband router?
defines which addresses are allowed into the router

14. A system administrator is unable to ping the Serial0/0 interface of RouterB from RouterA. During the troubleshooting process, the following facts are established: (0 / 5)
- IP addressing and subnet masks are correct.
- RouterA is a Cisco router and RouterB is a router from another vendor.
- RouterA is configured with the default encapsulation.
- The serial interfaces on both routers are up.
- The protocol is down on the serial interfaces of both routers.

15. What should the administrator do to solve the problem?
Change the encapsulation on both routers to PPP.

16. 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 the dialer list to exclude ICMP as interesting

17. - call is made (1 / 6)

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

19. Which of the following are valid steps for a basic ISDN BRI configuration?
set the SPIDs if required by the ISDN switch

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Comments :

Yugo said...

In question 11 should be: ITU-T Q.931

ITU-T Q.921 isn't a protocol, it's standard... ble ble :P

I don't read all - maybe it's good...

Here you got a cat: ^^;;:::;;---


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