Qa

As mentioned in the introduction, you have two choices for review questions. The questions that follow give you a bigger challenge than the exam itself by using an open-ended question format. By reviewing now with this more difficult question format, you can exercise your memory better and prove your conceptual and factual knowledge of this chapter. The answers to these questions are found in Appendix A.

For more practice with exam-like question formats, including questions using a router simulator and multiple-choice questions, use the exam engine on the CD.

1. What is the main purpose(s) of Layer 2?

2. What is the main purpose(s) of Layer 1?

3. What does MAC stand for?

4. Name three terms popularly used as a synonym for MAC address.

5. What portion of a MAC address encodes an identifier representing the manufacturer of the card?

6. Are MAC addresses defined by a Layer 2 or Layer 3 protocol?

7. How many bits are present in a MAC address?

8. Name the two main parts of a MAC address. Which part identifies which "group" this address is a member of?

9. What OSI layer typically encapsulates using both a header and a trailer?

10. If a Fast Ethernet NIC currently is receiving a frame, can it begin sending a frame?

11. What are the two key differences between a 10-Mbps NIC and a 10/100 NIC?

12. What is the distance limitation of a single cable for 10BASE-T? For 100 BASE-TX?

13. How fast is Fast Ethernet?

14. How many bytes long is a MAC address?

15. Define the difference between broadcast and multicast MAC addresses.

16. Explain the function of the loopback and collision-detection features of an Ethernet NIC in relation to half-duplex and full-duplex operations.

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