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Q&A 605
Q&A
As mentioned in Chapter 1, "All About the Cisco Certified Network Associate Certification,"
the questions and scenarios in this book are more difficult than what you should experience on
the actual exam. The questions do not attempt to cover more breadth or depth than the exam;
however, they are designed to make sure that you know the answer. Rather than allowing you
to derive the answer from clues hidden inside the question itself, the questions challenge your
understanding and recall of the subject. Questions from the "Do I Know This Already?" quiz
from the beginning of the chapter are repeated here to ensure that you have mastered the
chapter's topic areas. Hopefully, these questions will help limit the number of exam questions
on which you narrow your choices to two options and then guess.
The answers to these questions can be found in Appendix A, on page 768.
1
Name two WAN data link protocols for which the standards define a protocol type field,
which is used to define the type of header that follows the WAN data link header.
2
Name two WAN data link protocols that define a method of announcing the Layer 3
addresses of the interface to other devices attached to the WAN.
3
What does the acronym LAPD stand for? Is it used as the Layer 2 protocol on dialed ISDN
bearer channels? If not, what is used?
4
"Frame Relay uses source and destination DLCIs in the Frame Relay header, with length
10, 11, or 12 bits." Which parts of this statement do you agree with? Which parts do you
disagree with? Why?
5
Explain the purpose of Inverse ARP. Explain how Inverse ARP uses Frame Relay
broadcasts.
6
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?
7
What does NBMA stand for? Does it apply to PPP links? What about X.25 networks or
Frame Relay networks?
8
Define the terms DCE and DTE in the context of the physical layer and a point-to-point
serial link.
9
What layer of OSI is most closely related to the functions of Frame Relay? Why?
10
When Inverse ARP is used by default, what additional configuration is needed to get IGRP
routing updates to flow over each VC?
11
Define the attributes of a partial-mesh and full-mesh Frame Relay network.
12
What key pieces of information are required in the frame-relay map statement?
ch08.fm Page 605 Monday, March 20, 2000 5:17 PM