Information Technology Reference
In-Depth Information
Q & A
The Q & A questions are more difficult than what you can expect 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 retain the material. Rather than allowing you to derive the
answer from clues hidden inside the question itself, these questions challenge your understanding
and recall of the subject. Questions from the “Do I Know This Already?” quiz are repeated here
to ensure that you have mastered the chapter's topic areas. A strong understanding of the
answers to these questions will help you on the CCIE written exam. As an additional study aide,
use the CD-ROM provided with this topic to take simulated exams.
Select the best answer. Answers to these questions are in the Appendix, “Answers to Quiz
Questions.”
Which framing standard does X.25 use?
1
a. HDLC
b. LAPB
c. LAPF
d. LAPD
What is the significance of the DE bit?
2
a. Used in X.25 as a discard error to recover frames
b. Used in ATM to recover from cells with errors
c. Used in Frame Relay to specify discard eligible frames
d. Used in PPP to discard frames
What is an NT1 in ISDN architecture?
3
a. A device that connects the TE2 to the LE
b. Usually lies between the R and S reference points
c. Same as a NT4
d. A device that connects the 4-wire BRI to the 2-wire phone line
What is a BECN in Frame Relay?
4
a. A notification to the destination, indicating congestion in the path from source to
destination
b. A notification to the source, indicating congestion in the path from source to
destination
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