Error Control-ARQ (automatic repeat request)

• Two basic error types:

  • lost frame (or ack/ control frame)
  • damaged frame (or ack/ control frame)

• Control Mechanisms

  • error detection via CRC
  • retransmission after timeout
  • negative acks & retransmission

• Three Common Versions:

  • Stop & Wait ARQ
  • Go-back-N ARQ
  • Selective-reject ARQ

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