Homework_1_Fall_2010

Homework_1_Fall_2010 - Name: _ Student ID: _ CS 132 -...

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Name: _________________________________________ Student ID: _____________ CS 132 Fall 2010 Homework 1 1 CS 132 - Computer Networks (Prof. Tatsuya Suda) School of Information & Computer Science University of California, Irvine Fall 2010 Homework 1 1. Explain amplitude modulation, phase modulation and frequency modulation. 2. Why do we use layering in computer networks? 3. Name the 7 OSI layers and give the corresponding functionalities for each layer. 4. Briefly describe the difference between simplex, half duplex and full duplex transmissions. 5. Name a popular error detection and correction mechanism and describe how each works. 6. Explain the difference between a reactive and preventative congestion control method. List some examples of each congestion control method and explain how they work. 7. Name 2 popular flow control mechanisms and describe how each works. 8. Please explain Stop and Wait and Sliding Window protocols. 9. What is piggybacking? What are its advantages and disadvantages? 10. Name 4 popular congestion control mechanisms and describe how each works. 11. Name 3 Multiple Access Protocols and describe how each works. 12. Compare and contrast the network performance of the 3 Multiple Access Protocols in terms of transmission delay. 13. Briefly define each of the following terms a) frame b) host c) subnet d) router 14. Indicate whether each of the following statements is true (T) or false (F): a) In sliding window protocols, the sender’s window size and the receiver’s window size must be the same. b) In sliding window protocols, the receiver’s window size may change from time to time. c) Frames which fall outside the receiving window are saved at the receiver’s buffer.
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Name: _________________________________________ Student ID: _____________ CS 132 Fall 2010 Homework 1 2 d) The time needed for a signal to travel from sender to receiver is known as transmission time. e) When the network traffic is heavy, Random access protocol has shorter delay than both demand assignment protocol and fixed assignment protocol. f) In Character Oriented Protocol, frame length is a multiple of character size. 15. Give a short explanation of the two major types of routing (fixed routing and dynamic routing). 16. Explain how the Go-Back-N and Selective Repeat protocols work. Come up with some example transmission sequences, and illustrate how they work for them. Which one has the better throughput? Which one requires less buffer space at the receiver? (Use diagrams for your explanation if necessary) 17. Repeat Question 16 above now assuming that some data frames are lost. 18. Repeat Question 16 above now assuming that some acknowledgement frames are lost. 19.
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Homework_1_Fall_2010 - Name: _ Student ID: _ CS 132 -...

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