3) Bandwidth-delay product Suppose two hosts, A and B, are separated by 30,000 Km and are connected by a direct link of R=3 Mbps. Suppose the propagation speed over the link is 2.5*108 m/s.

a) Calculate the bandwidth-delay product R* dprop. (2 points)

b) Consider sending a file of 1,200,000 bits from host A to host B. Suppose the file is sent continuously as a large message. What is the maximum number of bits that will be in the link at any time? (2 points)

c) What is the width (in meters) of a bit in the link? (2 points)

d) Repeat (a), (b) and (c) but now with a link of 3 Gbps. (6 points)