What are relative advantages and disadvantages of persistent and non-persistent CSMA protocols? What makes you select one over the other? Explain clearly.
What will be an ideal response?
Advantages of persistent CSMA:
The terminal will keep listening to the medium when it senses the medium busy.
Then it will capture the channel immediately after the medium becomes idle.
Thus, 1-persistent CSMA will have good channel utilization when traffic is light.
The p-persistent CSMA works better when traffic is heavy.
Disadvantages of persistent CSMA:
When traffic is heavy, 1-persistent causes more collisions because it is highly
possible that more than one terminal sense the medium immediately after the
medium becomes idle.
Advantages of non-persistent CSMA:
It can reduce the collisions by waiting for a random time to sense the medium
again after it senses the medium is busy. It is especially useful when traffic is
heavy.
Disadvantages of non-persistent CSMA:
It may waste the channel by waiting for an unnecessary random time to sense the
medium again due to light traffic.
Therefore, it is better to choose 1-persistent CSMA when traffic is light, and nonpersistent CSMA or p-persistent CSMA when traffic is heavy.
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