Suppose that between A and B there is a router R. The A-R bandwidth is infinite (that is, packets are not delayed), but the R-B link introduces a bandwidth delay of 1 packet per second (that is, 2 packets take 2 seconds, etc.). Acknowledgments from B to R, though, are sent instantaneously. A sends data to B over a TCP connection, using slow start but with an arbitrarily large window size. R has a queue size of 1, in addition to the packet it is sending. At each second, the sender first processes any arriving ACKs and then responds to any timeouts.
(a) Assuming a fixed Time Out period of 2 seconds, what is sent and received for T = 0, 1, ... , 6 seconds? Is the link ever idle due to timeouts?
(b) What changes if Time Out is 3 seconds instead?