Google Code-in

examples/tutorial/fifth.cc is a simple example that explains how to plot a TCP congestion window in ns-3. This task is about comparing the congestion window plots for TCP Newreno and TCP Highspeed. Follow the steps given below to complete the task:

1. Copy fifth.cc from examples/tutorial and paste it in the scratch directory.
2. Run fifth.cc and plot the congestion window as explained in the link given below.
3. The default TCP in ns-3 is Newreno, so the congestion window plot obtained from the previous step would be for Newreno.
4. Modify the fifth.cc program to enable TCP Highspeed. You may use examples/tcp/tcp-variants-comparison.cc as a reference.
5. Run the modified fifth.cc and plot the congestion window for TCP Highspeed.
6. Combine both the congestion window plots in a single graph with proper labels on axes and legends.
7. Send a PNG image of the graph for evaluation where congestion windows of TCP Newreno and TCP Highspeed are compared.
8. Send a patch with the changes made in fifth.cc for evaluation.