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Microsoft Word - TCP Performance-OPNET Assignment.docx.pdf

TCP Performance-OPNET

1. Duplicate the scenario and rerun the simulation using client TCP window sizes of 16 KB, 24 KB, 32 KB, 48 KB, and 64 KB. To change the buffer size, Right click on the FTP Client, and choose Edit Attributes. Expand the TCPa`TCP Parameters attribute and set the Receive Buffer (bytes) field. Note the download response time for each window size. Plot the values using a spreadsheet. How does the window size affect the download time?

2. For the same download times you found in Question 1, calculate the corresponding TCP throughputs.

3. Explain the advantages of implementing a small receive window size. Explain the advantages of implementing a large window size.

4. What would be the effect of increasing the capacity of the lines connecting the server and client to the IP cloud to DS-3 speeds (45 Mbps)? Duplicate the scenario and rerun the simulation to verify your hypothesis and provide statistics to support your answer.

5. What would be the effect of decreasing the capacity of the lines connecting the server and client to the IP cloud to DS-0 speeds (64 Kbps)? Duplicate the scenario and rerun the simulation to verify your hypothesis and provide statistics to support your answer.

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