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Gateforum Correspondence Course ( Page #85, QNo# 16 )

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2 Answers

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When sender window and receiver window is 1 then stop and wait...

A. True ...in SR we need to keep receiver window size less than or equal to sender window size

B. False ..Here sender window can be greater than 1

C. False ...Here sender and receiver window not need to be 1..

D.GBN always receiver window 1...and when sender and receiver window same means sender window must be 1...so it is true
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Stop-and-Wait ARQ is a special case of Go-Back -N ARQ in which the size of the send window is 1.

So,Answer should be D.
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