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In which transmission mode can data travel in both directions, but only one direction at a time ?

  • A.Simplex
  • B.Half-duplex
  • C.Full-duplex
  • D.Multiplex

Answer: D

Correct answer: Half-duplex

Half-duplex allows each end to transmit in turn but never simultaneously, as with a walkie-talkie. Simplex permits one direction only, and full-duplex allows both ends to send at once, as an ordinary telephone call does.

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