Homework 6

1. (1 point) What is the primary function of the data link layer?
2. What are some possible services provided by the data link layer?
3. What three kinds of problems must the data link layer deal with?
4. What are the two general types of links?
5. What is the difference between half-duplex and full-duplex?
6. (1 point) How does 2-dimensional parity work? What can it do that simple parity cannot do?
7. What is the purpose of a multiple access protocol.
8. What is the advantage of random access multiple access protocols over channel partitioning multiple access protocols?
9. Ethernet uses a CSMA/CD multiple access protocol. What does this mean?
10. (1 point) Briefly describe the Ethernet multiple access protocol.
11. What protocol is used for translating IP addresses to MAC addresses?
12. (1 point) What service does the Address Resolution Protocol provide? Be specific.
13. What are the logical and physical topologies of a modern Ethernet segment?
14. In which layers do each of the following devices operate?
    1. routers
    2. hubs
    3. switches
15. Why are switches replacing hubs in organizations local area networks?
16. What is a common use for the Point-to-Point Protocol?
17. (1 point) How can an ATM network serve as a virtual link in the internet?