In the _____ method, after the station finds the idle, it sends or refrains…
2017
In the _____ method, after the station finds the idle, it sends or refrains from sending based on probability.
- A.
Non-validating
- B.
P-persistent
- C.
One-persistent
- D.
Non-persistent
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Correct answer: B
Answer: P-persistent (पी-पर्सिस्टेंट) Explanation: In P-persistent CSMA, when a station finds the channel idle at a slot boundary, it transmits with probability p. If it does not transmit (with probability 1 − p), it waits for one slot time and then repeats the same procedure. If channel idle: transmit with probability p; otherwise defer for one slot.
This reduces collision probability compared to always-transmit strategies while allowing quicker channel access than waiting a random time.
Why the other common methods are different: One-persistent transmits immediately when the channel is idle (equivalent to p = 1), which can cause high collision rates.
Non-persistent waits a random time before sensing again if the channel is busy; it does not use a immediate probabilistic send-or-wait decision on seeing idle.
सारांश: प्रश्न में वर्णित probabilistic व्यवहार "P-persistent
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