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if an ethernet station collide 4 times to try to transmit a single frame .How long might it wait to be before the next attempt if time slot 51.2 micro sec ...................micro sec.

a. 768

b. 819.2

c.409.6

d. none

1 Answer

Best answer
1 votes
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If an ethernet station collides 4 times then k = 4

So according to exponential backoff algorithm , it has to wait a random amount of time which is given by :

 { 0 to 2k - 1 } * slot time 

So here random time = { 0 to 15 } * slot time 

                               = { 0 to 15 } * 51.2

                               =  0 to 768   [  Only integral multiples of 51.2 is allowed ]

So going by the options : 

B)  is false as it exceeds 768..

So A) and C) are correct answers 

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