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Go-Back-N ARQ

  • Retransmission begins with the last unacknowledged frame even if subsequent frames have arrived correctly .duplicate frames are discarded.
  • Go-back-n ARQ -- Receiver must get Frames in correct order


Selective Repeat ARQ

  • Only the unacknowledged frame is retransmitted.
  • It may be (slightly) more efficient than Go-back-n ARQ, but also much more complicated.
  • Selective repeat ARQ -- correctly-received out-of-order Frames are stored at Receiver until they can be re-assembled into correct order


Hamida Almangush
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14y ago

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