Question: Suppose two hosts, A and B, are separated by 25,000 kilometers and are connected by five links of R = 2 Mbps. Suppose the propagation

Suppose two hosts, A and B, are separated by 25,000 kilometers and are connected by five links of R = 2 Mbps. Suppose the propagation speed over the link is 2.510⁸ meters/sec.

A) Calculate the bandwidth-delay product, R d_propagation.

B) Consider sending a file of 800,000 bits from Host A to Host B. Suppose the file is sent continuously as one large message. What is the maximum number of bits that will be in the link at any given time?

C) Suppose now the file is broken up into 20 packets with each packet containing 40,000 bits. Suppose that each packet is acknowledged by the receiver and the transmission time of an acknowledgment packet is negligible. Finally, assume that the sender cannot send a packet until the preceding one is acknowledged. How long does it take to send the file?

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