Review Exercises

1. Contrast a LAN with a WAN.

2. What are the two basic underlying transmission techniques for a LAN?

3. Name the three basic LAN topologies. Identify a fourth that is a subset of one of the three.

4. What range of BER can we expect on LANs? How are such good BERs achieved?

5. If a LAN has 50 accesses, how many connectivities must be theoretically analyzed for sufficient S/N?

6. What two basic transmission problems must a designer face with a baseband LAN?

7. LLC derives from what familiar link-layer protocol?

8. Relate the IEEE 802 LAN standard model with the ISO seven-layer OSI model.

9. What is a LAN access protocol?

10. Name at least three responsibilities of the LLC.

11. What are the two services the LLC provides its users?

12. How are collisions detected with CSMA/CD?

13. What is the purpose of the jam signal on CSMA/CD?

14. What is the function of a frame check sequence (FCS)?

15. Give three reasons why a MAC frame may be invalid?

16. How does a LAN know that a traffic frame is destined to it?

17. What is frame stripping ?

18. How are collisions avoided using a token-passing scheme?

19. What is the function of a LAN repeater?

20. What are the four types of bridges covered in the text?

21. On what OSI layer do routers operate?

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