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# hw7 - CS/ECE 438 Communication Networks for Computers...

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CS/ECE 438: Communication Networks for Computers Spring 2010 Problem Set 7 Due: start of class, (date). Congestion Control and Performance Analysis Assigned reading: Peterson and Davie: Chapter 6. All problems carry equal weight. Please show all your work. 1. Random Early Detection Consider a FIFO queue with an RED dropping policy, with MaxP=0.02, MinThreshold=20, MaxThreshold=180. The current AvgLen=60. a. Find the drop probability P(count) for count=1 and count=40. b. Calculate the probability that none of the 40 packets are dropped. c. What is the probability that none of the 40 packets are dropped when AvgLen=220? 2. Fair Queuing In this problem you will simply show the scheduling times for a link using the following version of weighted fair queuing. Packets are stored in per-flow queues and per-flow counters track how much data has been sent from each flow. The counters are zero at time zero, and time zero is the first decision time. At each decision time: 1. Enter packets arriving at the decision time, if any, into the appropriate queues. 2.

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hw7 - CS/ECE 438 Communication Networks for Computers...

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