•Systems which automatically request the retransmission of missing packets or packets with errors are called ARQ systems. •Three common schemes –Stop & Wait –Go Back N –Selective Repeat Efficiency of Selective Repeat Protocol (SRP) is same as GO-Back-N’s efficiency : Selective Repeat Protocol in computer networks is a Sliding Window Protocol. Automatic Repeat ReQuest (ARQ) •When the receiver detects errors in a packet, how does it let the transmitter know to re-send the corresponding packet? SR Protocol or Selective Repeat ARQ is an implementation of sliding window protocol like Go back N Protocol. Figure – the sender only retransmits frames, for which a NAK is received. Selective repeat protocol, also called Selective Repeat ARQ (Automatic Repeat reQuest), is a data link layer protocol that uses sliding window method for reliable delivery of data frames. Here, only the erroneous or lost frames are retransmitted, while the good frames are received and buffered. Practice Problems based on Selective Repeat ARQ. In Selective Repeat ARQ, the size of the sender and receiver window must be at most one-half of 2^m.

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