Part1: For each of the following cases, calculate the latency (from first bit sent to the last bit received). Assume the bandwidth of each link is 2 Gbps, and the size of each packet is 100 Kb. Assume the length of each link is 20 meters and propagation speed in medium is 2*106 meters per second. There is no queuing or processing delay. a. If the source sends a message containing 1 packet and there is 1 router on the path. b. If the source sends a message containing 1 packet and there are 6 routers on the path. c. If the source sends a message containing 10 packets and there is 1 router on the path. d. If the source sends a message containing 10 packets and there are 6 routers on the path.

Part2: Now keep all assumptions from part1 except processing delay. Assume each router begins retransmitting a packet after it has finished receiving the packet and processed it for 6 microseconds. Processing delay is zero at source. Solve the problem for each of the 4 above-mentioned cases with this assumption.