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Computer Networking : A Top-Down Approach

Computer Networking : A Top-down Approach

Authors: James F. Kurose, Keith W. Ross
ISBN: 9780132856201
Edition: 6
Chapter: Transport Layer
Exercise: Problems
Question: 45

 

Question

Recall the macroscopic description of TCP throughput. In the period of time from when the connection’s rate varies from W/(2 · RTT) to W/RTT, only one packet is lost (at the very end of the period).

a. Show that the loss rate (fraction of packets lost) is equal to

 

b. Use the result above to show that if a connection has loss rate L, then its average rate is approximately given by

Answer

a.

Recall the macroscopic description of TCP throughput. In the period of time from when the connection’s rate varies from W/(2 · RTT) to W/RTT, only one packet is lost (at the very end of the period).

The loss rate L is the ratio of the number of packets lost over the number of packets sent.

The number of packets sent in a cycle is as shown below:

1 0

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