Please solve 1 Q

1-a. Suppose N packets arrive simultaneously to a link at which no packets are currently being transmitted or queued. Each packet is of length L and the link has transmission rate R. What is the average queuing delay for the N packets? (5points) b. Now suppose that N such packets arrive to the link every LNR seconds. What is the average queuing delay of a packet? (Spoints) 2- Consider sending a large file of F bits from Host A to Host B. There are three links (and two switches) between A and B, and the links are uncongested that is, no queuing delays). Host A segments the file into segments of S bits each and adds 80 bits of header to each segment, forming packets of L=80 + bits. Each link has a transmission rate of Rbps. Find the value of Sthat minimizes the delay of moving the file from Host A to Host B. Disregard propagation delay. (10points) 3-In mobile IP, what effect will mobility have on end-to-end delays of datagrams between the source and destination? Explain. (10points) 4-Suppose Alice and Bob are communicating over an SSL session. Suppose an attacker, who does not have any of the shared keys, inserts a bogus TCP segment into a packet stream with correct TCP checksum and sequence numbers (and correct IP addresses and port numbers). Will SSL at the receiving side accept the bogus packet and pass the payload to the receiving application? Why or why not? Explain. (15points) s. Consider the figure a (which is similar to Figure b ). A sender begins sending packetized audio periodically at t=1. The first packet arrives at the receiver at t=8 What are the delays (from sender to receiver, ignoring any playout delays) of packets 2 through 82 Note that each vertical and horizontal line segment in the figure has a length of 1, 2, or 3 time units. (Spoints) If audio playout begins as soon as the first packet arrives at t=8 the receiver at which of the first eight packets sent will not arrive in time for playout? (Spoints) |c. If audio playout begins at 1=9 which of the first eight packets sent will not arrive in time for playout? (5points) d. What is the minimum playout delay at the receiver that results in all of the first eight packets arriving in time for their playout? (10points) Packets generated Packets received 8 Time Fill rate = x Depletion rates! Internet Video server Client application buffer b