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Pls verify that Ans. would be 45 or 46 ?

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Bandwidth delay product= BW*RTT

=256*90

optimal window size= bd product/packet size =(256*90)/(64*8)

=45

this is best approach to solve this kind of questions
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Well , i will not give much Emphasis on this approach but you can do this if you dont remember the formula or confused in Middle..Dimension checking.

clearly we require here is sender Window size which should be obviously in bits , so $Bandwidth: Kb/Sec$  $RTT: Sec$  

so Answer: Bandwidth*RTT/ packet Size. :)
–1 votes
–1 votes
it will be 46

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sripo asked Jan 5, 2019
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I am unable to understand their explanation,can anyone explain it in a better way?