July2016 cs Q27

0. A pure ALOHA Network transmits 200 bit frames using a shared channel with 200 Kbps bandwidth. If the system (all stations put together) produces 500 frames per second, then the throughput of the system is ______.

Answer
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Option : B
Explanation : Throughput(S) in pure aloha is G * e^-2G: It is maximum when G = 1 / 2. i.e. S = 1 / 2 * (2.71)^{-2 * 1 / 2}=1 / 2 * (2.71)^-1 = 0.184. So, option (B) is correct.

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