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Never done any problem in concept called purging in networking. can anyone tell me how to approach this. is this in syllabus?

in Computer Networks
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Purging is nothing but removing unusable data from a system. (Not in the syllabus)

Coming to the question

At t0 both A and B start transmission-

At t1 there will be a collision, which will be exactly at the middle of the link = 20/2 = 10 micros.

at t2 both the station will know about the collision = 10 + 10 = 20 micros.

at time t3 A will be immediately allowed to retransmit cause K=0, but A will wait for one propagation delay time to make sure there is no bit present in the link (purging concept)

      So, at time t3= 20+20 = 40 micros, A starts packet retransmission.

 

Hope it helps.
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