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Which of the following access control methods is probabilstic ?

  • A.Polling
  • B.Contention
  • C.Token passing
  • D.Sliding window

Answer: D

Correct answer: Contention

In a contention scheme such as CSMA/CD a station transmits when it judges the medium free, and whether it succeeds depends on what other stations happen to do - so access is probabilistic. Polling and token passing grant access deterministically, by turn.

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