Do I Know This Already Quiz

The purpose of the "Do I Know This Already?" quiz is to help you decide whether you really need to read the entire chapter. If you already intend to read the entire chapter, you do not necessarily need to answer these questions now.

The ten-question quiz, derived from the major sections in "Foundation Topics" portion of the chapter, helps you determine how to spend your limited study time.

Table 4-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?" quiz questions that correspond to those topics.

Table 4-1 "Do I Know This Already?" Foundation Topics Section-to-Question Mapping

Foundations Topics Section

Questions Covered in This Section

OSI Layer 1 for Point-to-Point WANs

1-3, 6

OSI Layer 2 for Point-to-Point WANs

4, 5, 7

Packet-Switching Services

8-10

CAUTION The goal of self-assessment is to gauge your mastery of the topics in this chapter. If you do not know the answer to a question or are only partially sure of the answer, you should mark this question wrong for purposes of the self-assessment. Giving yourself credit for an answer that you correctly guess skews your self-assessment results and might provide you with a false sense of security.

1. Which of the following best describes the main function of OSI Layer 1 protocols?

a. Framing b. Delivery of bits from one device to another c. Addressing d. Local Management Interface (LMI)

e. DLCI

2. Which of the following typically connects to a four-wire line provided by a telco?

a. Router serial interface b. CSU/DSU

c. Transceiver d. Switch serial interface

3. Which of the following typically connects to a V.35 or RS-232 end of a cable when cabling a leased line?

a. Router serial interface b. CSU/DSU

c. Transceiver d. Switch serial interface

4. Which of the following functions of OSI Layer 2 is specified by the protocol standard for PPP, but is implemented with a Cisco proprietary header field for HDLC?

a. Framing b. Arbitration c. Addressing d. Error detection e. Identifying the type of protocol that is inside the frame

5. Which of the following WAN data link protocols on Cisco routers support multiple Layer 3 protocols by virtue of having some form of Protocol Type field?

b. HDLC

c. LAPB

d. LAPD

e. SDLC

f. None of the above

6. On a point-to-point WAN link between two routers, what device(s) are considered to be the DTE devices?

a. The routers b. The CSU/DSUs c. The central office equipment d. A chip on the processor of each router e. None of the above

7. Imagine that Router1 has three point-to-point serial links, one link each to three remote routers. Which of the following is true about the required HDLC addressing at Router1?

a. Router1 must use HDLC addresses 1, 2, and 3.

b. Router1 must use any three unique addresses between 1 and 1023.

c. Router1 must use any three unique addresses between 16 and 1000.

d. Router1 must use three sequential unique addresses between 1 and 1023.

e. None of the above.

8. What is the name of the Frame Relay field used to identify Frame Relay Virtual Circuits?

a. Data-link connection identifier b. Data-link circuit identifier c. Data-link connection indicator d. Data-link circuit indicator e. None of the above

9. Which of the following is true about Frame Relay virtual circuits?

a. Each VC requires a separate access link.

b. Multiple VCs can share the same access link.

c. All VCs sharing the same access link must connect to the same router on the other side of the VC.

d. All VCs on the same access link must use the same DLCI.

10. Which of the following defines a SONET link speed around 155 Mbps?

a.

T1

b.

T3

c.

DS3

d.

DS155

e.

OC-3

f.

OC-12

g.

OC-48

h.

OC-155

The answers to the "Do I Know This Already?" quiz are found in Appendix A, "Answers to the 'Do I Know This Already?' Quizzes and Q&A Sections." The suggested choices for your next step are as follows:

■ 8 or less overall score—Read the entire chapter. This includes the "Foundation Topics" and "Foundation Summary" sections and the Q&A section.

■ 9 or 10 overall score—If you want more review on these topics, skip to the "Foundation Summary" section and then go to the Q&A section. Otherwise, move to the next chapter.

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