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Authors:
James F. Kurose, Keith W. Ross
Chapter:
Application Layer
Exercise:
Problems
Question:22 | ISBN:9780132856201 | Edition: 6

Question

Consider distributing a file of F = 15 Gbits to N peers. The server has an upload rate of u s = 30 Mbps, and each peer has a download rate of d i = 2 Mbps and an upload rate of u. For N = 10, 100, and 1,000 and u = 300 Kbps, 700 Kbps, and 2 Mbps, prepare a chart giving the minimum distribution time for each of the combinations of N and u for both client-server distribution and P2P distribution.

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Answer

Consider the data:

F = 15 Gbits =15360 Mbits (Convert 1 Gbits=1024 Mbits)

s = 30 Mbps

 d i = 2 Mbps 

 minimum distribution time :

So, the minimum distribution time for each of the combinations of N and u for both client-server distribution and P2P distribution=7680 seconds

 

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