Suppose Host A wants to send a file of size F = 1500 bytes to Host B. The path from Host A to Host B has three links having rates R1 =500 kbps, R2 = 1 kbps, and R3 = 2 Mbps, respectively. Assume there is no other traffic on this network. Assume negligible processing delays. Assume the packets have a size of L = 520 bytes (20 bytes are for header - carry no data from the file - 1000 bytes for payload). Assume no other traffic in the network and negligible propagation delay. Answer the following questions:

a) What is the end-to-end delay from the time Host A starts transmitting the third packet to the time when the file is completely received at Host B? Motivate your calculation.

b) How much queuing delay does the second packet experience in the case where R1 =1 kbps, R2 = 2 Mbps, and R3 = 500 kbps, respectively? Motivate your calculation.