Lab3 - EC441:IntroductiontoComputerNetworking Fall2009 Lab3...

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 EC 441: Introduction to Computer Networking Fall 2009 U Lab 3      Solutions     Question 1 Stop-and-Wait simulation. For P loss =0.2 and a=2 plot and print the simulated time diagram. Explain the diagram in detail for the 16 first time units. Mark the moments of time when time-outs have expired and a packet is resent. Answer: This is a sample result from the simulation. In this particular scenario time- outs happen 4 times in the 16 first time units. (Twice for packet #1, once for packet #2, once for packet #3).
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Question 2 a) Stop-and-Wait simulation. Plot and print the simulated performance curve for P loss =0, P loss =0.2 and P loss =0.4 . Explain what happens to the link utilization when P loss is increasing. Explain what happens to the link utilization when a is increasing. Answer: The link utilization decrease when P loss is increasing because more packets get lost during transmissions and the sender needs to retransmit loss packets. The link utilizations decreases when
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This note was uploaded on 11/09/2010 for the course ECE 441 taught by Professor Davidstarobinski during the Fall '09 term at BU.

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Lab3 - EC441:IntroductiontoComputerNetworking Fall2009 Lab3...

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