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Enabling hardware flow control on a serial link allows the receiver to

  • A.raise the baud rate again whenever the buffer is empty
  • B.detect that the sender has disconnected
  • C.stop the sender when its buffer is nearly full
  • D.detect and correct a corrupted character

Answer: C

Correct answer: stop the sender when its buffer is nearly full

Hardware flow control gives the receiver a line it can deassert to say stop, and the sender pauses until it is reasserted. That prevents overrun on a link where the receiver cannot always keep up. It does nothing about corruption or disconnection, which need a checksum and a separate signal.

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