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ISRO | ISRO CS 2013 | Question 40

  • Last Updated : 08 May, 2018
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What will be the efficiency of a Stop and Wait protocol, if the transmission time for a frame is 20ns and the propagation time is 30ns?
(A) 20%

(B) 25%
(C) 40%
(D) 66%


Answer: (B)

Explanation: Efficiency of stop and wait protocol = 1 / (1 + 2a)
where, a = tpd / tx
tpd = propagation delay
tx = transmission delay

Efficiency = 1 / (1 + 2(30/20)) 
           = 1/4 * 100
           = 25 %


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