In the following schematic of a network each letter is a router. You have four packets to send. Each packet is 1Mbit. Assume processing delay is zero.

A ------------- B --------------- C

Assume that data travel with the speed of light from A to C. Assume that A is in LA, B in NY and C in Central Europe. The distance from A to B is approximately 4.5 million meters and the distance from B to C is 6 million meters.

1. Assume transmission rate is R=100Mbps for link AB and R for link BC. In other words, link BC has exactly the same transmission rate as link AB. a. When will each packet arrive at C? State your answer in ms for all questions. b. What is the average queuing delay at A? c. What is the average queuing delay at B?

2. Assume now that transmission rate for AB is R=100 Mbps but transmission rate for BC is 20 Mbps.

a. What is the average queuing delay at A? b. What is the arrival time at router C of each of the four packets?

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