Holidays' Homework

Please remember that last chance for presenting your project is  Tuesday January 8, 2013 and that in the class of Friday January 11 a short quiz will be held.

Keeping you busy over the holidays is not our goal, but a few exercises may prepare you for the quiz. So here you have some exercises that are due Friday 11, 2013.

1. Host A connects to host B using TCP to perform an HTTP request. Host B closes the connection once it has provided a response. Request size is 500 bytes and response size is 3000 bytes. The initial sequence number on A is 1000 and the initial sequence number on B is 5000. MSS for both hosts is 1460 bytes. Please detail the sequence of TCP segments exchanged from the beginning till the end of the connection (for each segment list: sender, sequence number, acknowledgement sequence number, active flags and number of data bytes) under the following conditions:
1. No flow control, no congestion control. Regular acknowledgements.
2. Same as before but using duplicate delayed acknowledgements.
3. Same as (2) but using congestion control. What is the congestion window size on each end when FIN is received?
2. Write a simple UDP echo server. (No need to create a class or method, just the main server loop).
3. During a TCP connection, one end receives a segment with recv_window = 0. What does it mean? What does this end do if there is application data to be transmitted?
4. Assuming all TCP segments transmitted are acknowledged right away, what is the value of the congestion window after sending 35 segments after a Timeout if Threshold = 32?