Efficiency of CSMA/CD
Carrier sense multiple access with collision detection (CSMA/CD) –
The CSMA method does not tell us what to do in case there is a collision. Carrier sense multiple access with collision detection (CSMA/CD) adds on to the CSMA algorithm to deal with the collision. In CSMA/CD, the size of a frame must be large enough so that collision can be detected by sender while sending the frame. So, the frame transmission delay must be at least two times the maximum propagation delay.
Assume some station transmitted data packet and successfully get to the destination but it just the Best Case, so we have to take Worst Case scenario in which there will be contention slots. Contention slots are those slot which are not able to transmit their journey due to the collision. Suppose A station transmitted data but collide and worst case time wasted is 2Tp and then some station B found out a way to transmit the data so it took. (As shown in Figure)
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