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Ethernet

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1 1 vote
A LAN uses CSMA/CD protocol. The end to end propagation delay between station is 125 micro second. What is the contention period of LAN(in micro second).

a) 62.5

b) 125

c) 250

d) 187.5

1 Answer

Best answer
7 7 votes

 A contention period or contention slot is the minimum time a host must transmit such that it can be sure that no other host packets has been transmitting.

For LAN'S using  CSMA/CD ,Contention period  must be twice the propagation delay (2*Tp).

It takes minimum of RTT time to detect collision.

So Contention period = 2*Tp = 2*125 micro second = 250 micro second.

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