1. A-Consider three computers A, B and C- each is connected to a router X. The link between A and X has propagation delay of 10 msec and a capacity of 5 Mbps. The link between B and X has a propagation delay of 5 msec and a capacity of 2 Mbps. The link between C and X has propagation delay of 2 msec and a capacity of 8 Mbps. Answer the following questions:

A) If both computers, A and B, blast packets to computer C at their maximum possible rate, would there be any capacity left on the link between C and X? If your answer is no, indicate why. If your answer is yes, indicate how much capacity is available.

B) Which lInk of those three has the maximum carrying capacity? What is that carrying capacity? Your answer should be in KB.

C) If computer A sends a 1000- Bytes packet to C and computer B sends a 1300-Bytes packet to C. If both packets were sent at the same time, which one of those two packets would be the first to arrive fully at C? How long would it take that packet to arrive fully at router X?

D) How many bits would you allocate for the Sequence Numbers field in you run a sliding window protocol on the link between A and X? Assume packets are 1000 bytes.

E) How long would it take to transfer 1 MB file, using a stop and wait protocol, between A and B? You can assume that each packet is 1500 Bytes with 60 Bytes of those are used for headers? Assume that RTT is 30 msec and assume that no packets are lost.