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 3-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?" quiz questions that correspond to those topics.
Foundations Topics Section
Questions Covered in This Section
OSI Perspectives on Local-Area Networks
Early Ethernet Standards
3, 7, 8
Ethernet Data Link Protocols
2, 4, 6, 9
Recent Ethernet Standards
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 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. CSMA/CD
e. Defining the size and shape of Ethernet cards
2. Which of the following are part of the functions of OSI Layer 2 protocols?
a. Framing b. Delivery of bits from one device to another c. Addressing d. Error detection e. Defining the size and shape of Ethernet cards
3. Which of the following is true about Ethernet crossover cables?
a. Pins 1 and 2 are reversed on the other end of the cable.
b. Pins 1 and 2 connect to pins 3 and 6 on the other end of the cable.
c. Pins 1 and 2 connect to pins 3 and 4 on the other end of the cable.
d. The cable can be up to 1000 m to cross over between buildings.
e. None of the above.
4. Which of the following are true about the format of Ethernet addresses?
a. Each manufacturer puts a unique code into the first 2 bytes of the address.
b. Each manufacturer puts a unique code into the first 3 bytes of the address.
c. Each manufacturer puts a unique code into the first half of the address.
d. The part of the address that holds this manufacturer's code is called the MC.
e. The part of the address that holds this manufacturer's code is called the OUI.
f. The part of the address that holds this manufacturer's code has no specific name.
5. Which of the following is true about the Ethernet FCS field?
a. It is used for error recovery.
c. It resides in the Ethernet trailer, not the Ethernet header.
d. It is used for encryption.
e. None of the above.
6. Which of the following fields can be used by Ethernet as a "type" field, to define the type of data held in the "data" portion of the Ethernet frame?
a. The DIX Ethernet DSAP field b. The IEEE 802.2 Ethernet Type field c. The IEEE 802.2 Ethernet DSAP field d. The SNAP header Protocol Type field e. None of the above.
7. Which of the following are true about the CSMA/CD algorithm?
a. The algorithm never allows collisions to occur.
b. Collisions can happen, but the algorithm defines how the computers should notice a collision and how to recover.
c. The algorithm works only with two devices on the same Ethernet.
d. None of the above.
8. Which of the following would be a collision domain?
a. All devices connected to an Ethernet hub b. All devices connected to an Ethernet switch c. Two PCs, with one cabled to a router Ethernet port with a crossover cable, and the other PC cabled to another router Ethernet port with a crossover cable.
d. None of the above
9. Which terms describe Ethernet addresses that can be used to communicate with more than one device at a time?
a. Burned-in address b. Unicast address c. Broadcast address d. Multicast address e. None of the above
10. With autonegotiation on a 10/100 card, what characteristics are negotiated if the device on the other end does not perform negotiation at all?
a. 100 Mbps, half duplex b. 100 Mbps, full duplex c. 10 Mbps, half duplex d. 10 Mbps, full duplex
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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