CCNA 4 - Modul 3

1. Which best describes the benefit of using Frame Relay as opposed to a leased line or ISDN service?

** Customers only pay for the local loop and the bandwidth they purchase from the network provider.

2. Which statement about Frame Relay subinterfaces is correct?

** Point-to-point subinterfaces act like leased lines and eliminate split-horizon routing issues.

3. What best describes the use of a data-link connection identifier (DLCI)?

** locally significant address used to identify a virtual circuit

4. What is created between two DTEs in a Frame Relay network?

** virtual circuit

5. Which two items allow the router to map data link layer addresses to network layer addresses in a Frame Relay network? (Choose two.)

** Inverse ARP
** LMI status messages

6. Refer to the exhibit. What can be known about the configuration of router R1 from the output?

** The command encapsulation frame-relay ietf has been used on the Serial 0/0/0 interface.

7. Refer to the exhibit. Which two outcomes occur from the configuration shown? (Choose two.)

** The router will use DLCI 22 to forward data to 10.1.1.1.
** Frames arriving on interface serial 0/0/0 of RT_1 will have a data link layer address of 22.

8. Refer to the exhibit. What effect does the point-to-point configuration on subinterface S0/0.110 have on the operation of the router?

** It eliminates split horizon issues without increasing the likelihood of routing loops.

9. Refer to the exhibit. You are a network administrator who has been tasked with completing the Frame Relay topology that interconnects two remote sites. Router HQ belongs to both the 172.16.1.0/24 and 172.16.2.0/24 subnets with IP addresses of 172.16.1.3 and 172.16.2.3 respectively. Traffic between R1 and R2 must travel through HQ first. How should the serial interface on HQ be configured to complete the topology?

** two point-to-point subinterfaces

10. Refer to the exhibit. What can be determined about the configuration of router R1 from the exhibited output?

** The LMI type for the Serial 0/0/0 interface has been left to its default configuration.

11. Refer to the exhibit. What can be determined about the Frame Relay switch from the output shown?

** It is experiencing congestion.

12. Refer to the exhibit. Which two statements are true given the output shown? (Choose two.)

** The local DLCI number is 401.
** Inverse ARP is being used on this connection.

13. Refer to the exhibit. A ping is sent to address 192.168.50.10 from the Peanut router. Which DLCI will be used to send the ping?

** 110

14. Refer to the exhibit. Router R1 has been configured for Frame Relay connectivity to routers R2 and R3. Which set of configuration options for routers R2 and R3 would provide each router connectivity to R1?

** R2(config)# interface serial0/0/1.201 point-to-point
R2(config-if)# frame-relay interface-dlci 201
R3(config)# interface serial0/0/1.301 point-to-point
R3(config-if)# frame-relay interface-dlci 301

15. Refer to the exhibit. Which statement explains why the Frame Relay connection between R1 and R2 is failing?

** The frame-relay map commands are using incorrect DLCIs.

16. Refer to the exhibit. Router R2 is part of a Frame Relay network that uses OSPF for IP routing. After the commands that are shown are entered, R2 will not exchange OSPF information correctly. What is the likely cause?

** The frame-relay map command requires the broadcast keyword.

17. Refer to the exhibit. When troubleshooting a Frame Relay connection, an administrator entered the show interfaces s0/0 command and received the output shown in the exhibit. What are two probable reasons for this problem? (Choose two.)

** The router is not configured for the same Frame Relay PVC as the switch.
** The LMI type on the Frame Relay switch is NOT ANSI.

18. Refer to the exhibit. What can be determined from the output?

** Serial 0/0/0 has been configured with an DLCI of 201.

19. What consideration must be taken into account if RIP is used on Frame Relay multiaccess networks?

** To forward routing updates, address-to-DLCI mapping must be done via the use of the frame-relay map command coupled with the broadcast keyword.

20. Which three actions does a Frame Relay switch perform when it detects an excessive build-up of frames in its queue? (Choose three.)

** drops frames from the queue that have the DE bit set
** sets the FECN bit on all frames it receives on the congested link
** sets the BECN bit on all frames it places on the congested link

21. What two methods does Frame Relay technology use to process frames that contain errors? (Choose two.)

** Frame Relay services depend on the upper layer protocols to handle error recovery.
** The receiving device drops any frames that contain errors without notifying the sender.

22. Refer to the exhibit. Router R1 has been configured for Frame Relay connectivity to routers R2 and R3. What configuration option should be configured on the R2 and R3 serial interfaces in order for all routers to ping each other successfully?

** R2(config-if)# frame-relay map ip 10.1.1.1 201 broadcast
R2(config-if)# frame-relay map ip 10.1.1.3 201 broadcast
R3(config-if)# frame-relay map ip 10.1.1.1 301 broadcast
R3(config-if)# frame-relay map ip 10.1.1.2 301 broadcast

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