ISRO | ISRO CS 2013 | Question 40

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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