# Kurose and Ross Edition 6 Exercise 1 Question P28 (Page No 76)

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Suppose two hosts, A and B, are separated by 20,000 kilometers and are connected by a direct link of R = 2 Mbps. Suppose the propagation speed over the link is $2.5×10^8$meters/sec.

1. How long does it take to send the file, assuming it is sent continuously?
1. 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?
2.  Compare the results from (a) and (b).
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Hi for part a), data size isn't mentioned?
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@manisha11

You can calculate from Part b), which says that 20 packets each of size 40,000 bits.

@ajaysoni1924

a) 400.16 sec

b) 403.2 sec

c) Part b) is Stop and Wait

edited

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