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 6-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?" quiz questions that correspond to those topics.

Table 6-1 "Do I Know This Already?" Foundation Topics Section-to-Question Mapping

Foundations Topics Section

Questions Covered in This Section

Typical Features of OSI Layer 4


The Transmission Control Protocol

1-3, 5-8, 10

The User Datagram Protocol


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 protocols are connection-oriented?

a. Frame Relay b. TCP

e. Ethernet

2. Which of the following protocols are reliable?

a. Frame Relay b. TCP

e. Ethernet

3. PC1 is using TCP, has a window of 4, and sends four segments numbered 2, 3, 4, and 5 to PC2. PC2 replies with an acknowledgment number 5. What should PC1 do next?

a. Increase its window to five segments b. Increase its window by five more segments, for a total of nine c. Send segment 6

d. Resend segment 5

e. Resend segments 2 through 5

4. Which of the following are not features of a protocol that is considered to match OSI Layer 4?

a. Error recovery b. Flow control c. Segmenting of application data d. Conversion from binary to ASCII

5. Which of the following flow-control methods let the receiver tell the sender how much data the sender is allowed to send before the sender must wait for an acknowledgment?

a. Buffering b. Acknowledgments c. Windowing d. Congestion notification e. Congestion avoidance

6. Which of the following header fields identifies which TCP/IP application gets data received by the computer?


Ethernet Type


802.3 DSAP


SNAP Protocol Type


IP Protocol Field


TCP Port Number


UDP Port Number


Application ID


Congestion Avoidance

7. Which of the TCP connection-establishment flows sets both the SYN and ACK flags in the TCP header?

a. First segment b. Second segment c. Third segment d. Fourth segment e. Fifth segment

8. Which of the following is not a typical function of TCP?

a. Windowing b. Error recovery c. Multiplexing d. Routing e. Encryption f. Ordered data transfer

9. Which of the following functions is performed by TCP and UDP?

a. Windowing b. Error recovery c. Multiplexing d. Routing e. Encryption f. Ordered data transfer

10. Data that includes the Layer 4 protocol header, and data given to Layer 4 by the upper layers, not including any headers and trailers from Layers 1 to 3, is called what?



















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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