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What will happen if Ttrans> (Ttrans+2*Tprop) in efficiency formula of stop n wait protocol? What it logically mean?

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this is not possible , you are saying like this A>A+B (A and B are positive number )

 

Anyway in stop and wait you have to wait for acknowledge . (even if Tx>2Tp) if Tp is negligible then only efficiency is going to be 1 .
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It means you are transmitting through a balck hole where time is moving backward . so that at the other point of time you got the same packet till at one point you are still transffering it . ASTROPHYSICS. " time is relative" it is definitely possible Theoretically. my personal opinion is that time cannot run backwards. it can squeeze or slow down.

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