Sliding Window Activity

Done as teams of three

Steps

1. Open: http://www.ccs-labs.org/teaching/rn/animations/gbn_sr/

2. Try each of the following. Explain the difference, which is better, and why. Which has more overhead?

Protocol Window Size Timeout Packets per minute End to End Delay
Go Back N 5 11000 60 5000
Selective Repeat 5 11000 60 5000

3. Compare each of the following. Explain the difference. What is happening in the second case? Why? What does end-to-end delay represent in real networking.

Protocol Window Size Timeout Packets per minute End to End Delay
Go Back N 5 11000 60 5000
Go Back N 5 11000 60 12500

4. Try each of the following. Explain the difference between the two. Which is a problem? What is wrong with it? What characteristic does this model in real systems?

Protocol Window Size Timeout Packets per minute End to End Delay
Go Back N 5 11000 60 5000
Go Back N 5 4000 60 5000

5. Consider a system with a Window size of 10. What are the optimal values for the others values for maximum throughput efficency. What if we assume that one packet in 20 is lost.

Topic revision: r3 - 2015-10-04 - JimSkon
 
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