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if an ethernet station collide 4 time in trying to transmit a single frame how long might it be before the next attempt?
a)768 microsec
b)819.2 microsec
c)409.6 microsec
d)none

2 Answers

Best answer
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In general, after the cth failed attempt, resend the frame after k · 51.2μs, where k is a random integer between 0 and 2c − 1

 so here max waiting time occurs when we choose the value of k max between 0  to  2^4 - 1 = 15 

so we choose value of k =15. now waiting time = 15 *51.2 μs = 768 μs 

 ref: https://en.wikipedia.org/wiki/Exponential_backoff

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