Chapter 3

Question 1

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

Answer 1

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

Question 2

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

Answer 2

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

Question 3

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?

Answer 3

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

Question 4

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

Answer 4

Inverse ARP

LMI status messages

Question 5

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

Answer 5

The router will use DLCI 22 to forward data to 10.1.1.1.

Frames sent by 10.1.1.1 arriving on interface serial 0/0/0 of RT_1 will have a data link layer address of 22.

Question 6

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

Answer 6

It is experiencing congestion.

Question 7

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

Answer 7

Serial 0/0/0 has the feature frame-relay inverse-arp enabled.

Question 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?

Answer 8

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

Question 9

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

Answer 9

The frame-relay map commands are using incorrect DLCIs.

Question 10

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

Answer 10

locally significant address used to identify a virtual circuit

Question 11

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?

Answer 11

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

Question 12

Refer to the exhibit. Frame Relay connectivity has been configured in the network and OSPF is used as the routing protocol. Router R1 can successfully ping the router R2 serial interface. When R1 attempts to ping network 192.168.3.0/24 the ping fails. What additional configuration should be applied on all routers to remedy the problem?

Answer 12

Add the broadcast keyword in the Frame Relay map command on both routers.

Question 13

Which statement about Frame Relay subinterfaces is correct?

Answer 13

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

Question 14

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

Answer 14

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

Question 15

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

Answer 15

virtual circuit

Question 16

Which Frame Relay topology is a compromise of costs, reliability, and complexity when the WAN contains one headquarters site, 40 regional sites, and several sites within each regional site?

Answer 16

partial mesh

Question 17

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?

Answer 17

110

Question 18

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

Answer 18

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.

Question 19

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

Answer 19

The local DLCI number is 401.

Inverse ARP is being used on this connection

Question 20

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

Answer 20

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

Question 21

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

Answer 21

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.

Question 22

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?

Answer 22

two point-to-point subinterfaces