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In which communication, poll/select method used to determine control of the line ?

  • A.peer-to-peer
  • B.peer-to-primary
  • C.primary-to-peer
  • D.primary-to-secondary

Answer: D

Correct answer: primary-to-secondary

Poll and select belong to a configuration with one primary station controlling several secondaries: the primary polls a secondary to invite it to send, and selects it to warn it that data is coming. Peers by definition need no such controller.

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