Automatic Repeat-reQuest


Automatic Repeat-reQuest (ARQ), also known as Automatic Repeat Query, is an error-control method for data Communication that uses acknowledgements (messages sent by the receiver indicating that it has correctly received a data Frame or packet) and timeouts (specified periods of time allowed to elapse before an acknowledgment is to be received) to achieve reliable data transmission over an Unreliable protocol.

If the sender does not receive an acknowledgment before the timeout, it usually re-transmits the frame/packet until the sender receives an acknowledgment or exceeds a predefined number of re-transmissions .

Advice to link designers on link Automatic Repeat-reQuest (ARQ) is defined in BCP 62

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