Category Archives: Frame Relay

Frame Relay

640-802 WAN & Frame Relay Real Questions

Question 1:
The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router.
Which of the following statements is true concerning this command?
A: This command should be executed from the global configuration mode.
B: The IP address 10.121.16.8 is the local router port used to forward data.
C: 102 is the remote DLCI that will receive the information.
D: This command is required for all Frame Relay configurations.
E: The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC.

Correct Answers: E

Question 2:
Refer to the exhibit. Which statement describes DLCI 17?

wan2 640 802 WAN & Frame Relay Real Questions

A: DLCI 17 describes the ISDN circuit between R2 and R3.
B: DLCI 17 describes a PVC on R2. It cannot be used on R3 or R1.
C: DLCI 17 is the Layer 2 address used by R2 to describe a PVC to R3.
D: DLCI 17 describes the dial-up circuit from R2 and R3 to the service provider.

Correct Answers: C

Question 3:
A default Frame Relay WAN is classified as what type of physical network?

A: point-to-point
B: broadcast multi-access
C: nonbroadcast multi-access
D: nonbroadcast multipoint
E: broadcast point-to-multipoint

Correct Answers: C

Question 4:
Which of the following are key characteristics of PPP? (Choose three.)
A: can be used over analog circuits
B: maps Layer 2 to Layer 3 address
C: encapsulates several routed protocols
D: supports IP only
E: provides error correction

Correct Answers: A C E

Question 5:
Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN? (Choose three)
A: HDLC
B: Ethernet
C: Token Ring
D: PPP
E: FDDI
F: Frame Relay

Correct Answers: A D F

Question 6:
Refer to the exhibit. What is the meaning of the term dynamic as displayed in the output of the show frame-relay map command shown?

wan6 640 802 WAN & Frame Relay Real Questions

A: The Serial0/0 interface is passing traffic.
B: The DLCI 100 was dynamically allocated by the router
C: The Serial0/0 interface acquired the IP address of 172.16.3.1 from a DHCP server
D: The DLCI 100 will be dynamically changed as required to adapt to changes in the Frame Relay cloud
E: The mapping between DLCI 100 and the end station IP address 172.16.3.1 was learned through Inverse ARP

Correct Answers: E

Question 7:
Which of the following describes the roles of devices in a WAN? (Choose three.)
A: A CSU/DSU terminates a digital local loop
B: A modem terminates a digital local loop
C: A CSU/DSU terminates an analog local loop
D: A modem terminates an analog local loop
E: A router is commonly considered a DTE device
F: A router is commonly considered a DCE device

Correct Answers: A D E

Question 8:
How should a router that is being used in a Frame Relay network be configured to avoid split horizon issues from preventing routing updates?
A: Configure a separate sub-interface for each PVC with a unique DLCI and subnet assigned to the sub-interface
B: Configure each Frame Relay circuit as a point-to-point line to support multicast and broadcast traffic
C: Configure many sub-interfaces on the same subnet
D: Configure a single sub-interface to establish multiple PVC connections to multiple remote router interfaces

Correct Answers: A

Question 9:
What can a network administrator utilize by using PPP Layer 2 encapsulation? (Choose three.)
A: VLAN support
B: compression
C: authentication
D: sliding windows
E: multilink support
F: quality of service

Correct Answers: B C E

Question 10:
The Frame Relay network in the diagram is not functioning properly. What is the cause of the problem?

wan10 640 802 WAN & Frame Relay Real Questions

A: The Gallant router has the wrong LMI type configured
B: Inverse ARP is providing the wrong PVC information to the Gallant router
C: The S3 interface of the Steele router has been configured with the frame-relay encapsulation ietf command
D: The frame-relay map statement in the Attalla router for the PVC to Steele is not correct
E: The IP address on the serial interface of the Attalla router is configured incorrectly

By David Rupu Xiao CCIE #24177

Frame Relay

Understand Frame Relay in 5 Minutes

The simplified easiest way to Understand Frame Relay:

1. the serial interface has no layer 2 address
2. the DLCI number is the ID of the virtual cable

Look at the diagram below:

wan2 Understand Frame Relay in 5 Minutes

99 is the ID for the virtual cable between R1 and the Cloud.
16 and 17 are the two virtual cables between R2 and the Cloud.
28 is the ID for the virtual cable between R3 and the Cloud.

The ISP cloud connects cable 17 to cable 28, cable 16 to cable 99.
Keep in mind that there is no Layer 2 address on the Frame Relay serial interface.
Ok, that is our physical connection.

Now , let’s say we have IP address configured on these routers respective interface:

R1: 192.168.123.1
R2: 192.168.123.2
R3: 192.168.123.3

Now, we need to tell the routers how to reach others.

Router R2 uses cable 16 to reach R1, 17 to reach R3

R2:

Frame-relay map ip 192.168.123.1 16
Frame-relay map ip 192.168.123.3 17

Because of the ip 192.168.123.1 to the DLCI 16 mapping, packets destined for 192.168.123.1 will be put on cable 16.
Because cable 16 is connected to cable 99 by the Frame Relay ISP, the packets will go through cable 99 and arrive at R1.

Because of the ip 192.168.123.3 to the DLCI 17 mapping, packets destined for 192.168.123.3 will be put on cable 17.
Because cable 17 is connected to cable 28 by the Frame Relay ISP, the packets will go through cable 28 and arrive at R3.

wan2 Understand Frame Relay in 5 Minutes

Router R1 uses cable 99 to reach both R2 and R3, because that is the only cable connected to the cloud.

R1:

Frame-relay map ip 192.168.123.2 99
Frame-relay map ip 192.168.123.3 99

Because of the ip 192.168.123.2 to the DLCI 99 mapping, packets destined for 192.168.123.2 will be put on cable 99.
Because cable 99 is connected to cable 16 by the Frame Relay ISP, the packets will go through cable 16 and arrive at R2.

Because of the ip 192.168.123.3 to the DLCI 99 mapping, packets destined for 192.168.123.3 will be put on cable 99.
Because cable 99 is connected to cable 16 by the Frame Relay ISP, the packets will go through cable 16 and arrive at R2.
Now, R2 receives this packet which is destined for 192.168.123.3.
R2 checks its own ip to DLCI mapping, and would found 192.168.123.3 is mapped to 17.

R2 then put this packets on the virtual cable 17.
The packets would go through cable 17 and cable 28, and arrive at the right destination.

wan2 Understand Frame Relay in 5 Minutes

R3:

Frame-relay map ip 192.168.123.1 28
Frame-relay map ip 192.168.123.2 28

Because of the ip 192.168.123.2 to the DLCI 28 mapping, packets destined for 192.168.123.2 will be put on cable 28.
Because cable 28 is connected to cable 17 by the Frame Relay ISP, the packets will go through cable 17 and arrive at R2.

Because of the ip 192.168.123.1 to the DLCI 28 mapping, packets destined for 192.168.123.1 will be put on cable 28.
Because cable 28 is connected to cable 17 by the Frame Relay ISP, the packets will go through cable 17 and arrive at R2.

Now, R2 receives this packet which is destined for 192.168.123.1.
R2 checks its own ip to DLCI mapping, and would found 192.168.123.1 is mapped to 16.
R2 then put this packets on the virtual cable 16.
The packets would go through cable 16 and cable 99, and arrive at the right destination.

By David Rupu Xiao CCIE #24177