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. Name two of the methods of internal switching on typical switches today. Which provides less latency for an individual frame?

2. Describe how a transparent bridge decides whether it should forward a frame, and tell how it chooses the output interface.

3. Define the term collision domain.

4. Name two benefits of LAN segmentation using transparent bridges.

5. What routing protocol does a transparent bridge use to learn about Layer 3 addressing groupings?

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

7. Why did Ethernet networks' performance improve with the advent of bridges?

8. Why did Ethernet networks' performance improve with the advent of switches?

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

10. Assume that a building has 100 devices attached to the same Ethernet. These users then are migrated onto two separate shared Ethernet segments, each with 50 devices, with a transparent bridge between them. List two benefits that would be derived for a typical user.

11. Assume that a building has 100 devices attached to the same Ethernet. These devices are migrated to two different shared Ethernet segments, each with 50 devices. The two segments are connected to a Cisco LAN switch to allow communication between the two sets of users. List two benefits that would be derived for a typical user.

12. How fast is Fast Ethernet?

13. How does a transparent bridge build its address table?

14. How many bytes long is a MAC address?

15. Does a bridge or switch examine just the incoming frame's source MAC, the destination MAC, or both? Why does it examine the one(s) that it examines?

16. Define the term broadcast domain.

17. Describe the benefits of creating 3 VLANs of 25 ports each, versus a single VLAN of 75 ports, in each case using a single switch. Assume that all ports are switched ports (each port is a different collision domain).

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

19. Describe the benefit of the Spanning Tree Protocol as used by transparent bridges and switches.

20. Name the three reasons why a port is placed in forwarding state as a result of spanning tree.

21. Name the three interface states that the Spanning Tree Protocol uses other than forwarding. Which of these states is transitory?

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