Information Technology Reference
In-Depth Information
Wide-Area Networks
“Do I Know This Already?” Quiz
The purpose of this assessment quiz is to help you determine how to spend your limited
study time. If you can answer most or all of these questions, you might want to skim the
Foundation Topics section and return to it later as necessary. Review the Foundation Summary
section and answer the questions at the end of the chapter to ensure that you have a strong
grasp of the material covered. If you intend to read the entire chapter, you do not necessarily
need to answer these questions now. If you find these assessment questions difficult, read
through the entire Foundation Topics section and review it until you feel comfortable with
your ability to answer all of the “Q & A” questions at the end of the chapter. The following
questions are repeated at the end of the chapter in the Q & A section with additional
questions to test your mastery of the material.
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
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