week6lab - Jonathan Sullivan NETW310 02/14/10 Lab #6,...

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Unformatted text preview: Jonathan Sullivan NETW310 02/14/10 Lab #6, Network Flow Control Lab Report a 1. Looking at the above graph, write a short paragraph on what is happening here with the congestion window and the flight size. (17 points) Basically what I see happening is the network is limiting the number of segments by which the congestion window is increased during slow­start, which will help to improve performance for TCP connections with large congestion windows. The flight size is the amount of data that has been sent but not yet acknowledged. ‚ 2. In the Results Browser, bring up the Global TCP statistics for Delay (sec) and 2. In the Segment Delay sec). In a short paragraph, comment on the delay graph. (17 points) The only thing that I am seeing is just a bunch of propagation delay which is really nothing out of the ordinary. The segment delay in the graph is really causing a lot of latency on the network. ‚ 3. Overlay the statistics for Client Received Segment Ack Number and Sent 3. Overlay the statistics for Segment Ack Number. Write a short paragraph on why the Client numbers are so different from the servers and an explanation of what is happening. (16 points) The times are so small that a couple microseconds can have a huge effect on bandwidth. There are a large number of reasons that the client numbers are so different from the servers, the biggest being TCP and thread scheduling. Given enough time for TCP to reach steady state the difference will shrink. Also with more time most of the factors begin to drop out. SUMMARY In short, I have learned that a congestion window is basically a variable stated by TCP which will limit the amount of data a TCP can send. Furthermore, the connection flow rate does not depend on the level of congestion in the network. Also, without TCP congestion control, the Internet could have become history a long time ago. From this lab I have also learned that flight size is the amount of data that has been sent but not yet acknowledged. ...
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This note was uploaded on 02/15/2011 for the course NCM 545 taught by Professor Matter during the Spring '11 term at DeVry Oak Brook.

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