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s9 - CMPEN/EE 362 Asst 9 Solution Fall 2010 P roblem 1 a...

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CMPEN/EE 362 Asst. 9 Solution Fall 2010 Problem 1. a) Suppose a sender is allowed to sent a maximum window of 100,000 bits before an acknowledgment is received. The sender sends the 100,000 bits in 5 milliseconds and waits for acknowledgment before sending the next 100,000 bits. The sender continues to do this for a long time. The round trip time T to get back an acknowledgment might vary between 100 milliseconds and 1 second. Assuming no retransmissions, how would the effective data rate vary as T varies in this range? Solution . The effective rate is 100,000/T which would be the range 100kbits/second to 1 mbits/second. b) An often desired capability for controlling congestion is to reduce input data rate when congestion occurs. How does the natural effect of a) relate to this desire? Solution . Congestion increases T, which would automatically reduce the sender’s average rate. c) Some transport algorithms we will learn specify that there is a congestion window which is allowed to increase gradually when
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