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Q&A

As mentioned in the Introduction, you have two choices for review questions. The following questions give you a bigger challenge than the exam because they are open-ended. By reviewing with this more-difficult question format, you can exercise your memory better and prove your conceptual and factual knowledge of the topics covered in this chapter. The answers to these questions are found in Appendix A.

For more practice with exam-like question formats, including multiple-choice questions and those using a router simulator, use the exam engine on the CD.

  1. What two WAN data-link protocols define a method of announcing the interface's Layer 3 addresses to other devices attached to the WAN?

  2. explain the purpose of Inverse ARP, as well as how it uses Frame Relay broadcasts.

  3. Would a Frame Relay switch connected to a router behave differently if the IETF option were deleted from the encapsulation frame-relay ietf command on that attached router? Would a router on the other end of the VC behave any differently if the same change were made?

  4. What does NBMA stand for? Does it apply to X.25 networks or Frame Relay networks?

  5. Which layer or layers of OSI are most closely related to the functions of Frame Relay? Why?

  6. When Inverse ARP is used by default, what additional configuration is needed to get IGRP routing updates to flow over each VC, assuming IGRP has already been configured correctly?

  7. define the attributes of a partial-mesh and full-mesh Frame Relay network.

  8. What key pieces of information are required in the frame-relay map statement?

  9. create a configuration for Router1 that has Frame Relay VCs to Router2 and Router3 (DLCIs 202 and 203, respectively) on Router1's Serial1 interface. Use any IP addresses you like. Assume that the network is not fully meshed.

  10. What show command tells you when a PVC became active? How does the router know what time the PVC became active?

  11. What show command lists Frame Relay information about mapping? In what instances does the information displayed include the Layer 3 addresses of other routers?

  12. True or false: The no keepalive command on a Frame Relay serial interface causes no further Cisco-proprietary keepalive messages to be sent to the Frame Relay switch.

  13. What debug option shows Inverse ARP messages?

  14. True or false: The Frame Relay map configuration command allows more than one Layer 3 protocol address mapping on the same configuration command.

  15. What is the name of the field that identifies, or addresses, a Frame Relay virtual circuit?

  16. describe the difference between FRF.5 and FRF.8 service interworking.

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