a) Suppose you and two friends named Alex and Bob share a 200 Kilobits/sec DSL c

Question

a) Suppose you and two friends named Alex and Bob share a 200 Kilobits/sec DSL connection to the Internet. You need to download a 100 Megabyte file using FTP as soon as possible. Bob is also starting a 100 Megabyte file transfer, while Alice is watching a 150 Kilobits/sec streaming video using UDP. You have the opportunity to unplug either Alice or Bob's computer at the router, but you can't unplug both. To minimize the transfer time of your file, whose computer should you unplug and why? Assume the DSL connection is the only bottleneck link, and that your connection and Bob's connection have a similar round-trip time.

b) What if the rate of your DSL connection were 500 Kilobits/sec? Again, assuming that the DSL connection were the only bottleneck link, which computer should you unplug?

Explanation / Answer

a) As the internet speed is not enough, i.e. 200 kbps only,to minimise the transfer time, i should unplug Bob's file transfer.This is because using FTP for multiple file transfers for the same time decreases the transfer speed. As bob is also using FTP, he should be stopped. On the other hand, Alice is using UDP that is used for streaming video, so it will not affect the file transfer because UDP saves network bandwidth and increases throughput.

b)If the DSL rate is 500kbps, again bob's computer will be unplugged, reasons are same.

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