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Automatic Repeat reQuest (ARQ), also known as Automatic Repeat Query, is an error-control method for data transmission 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 ...
The simplest way (or more common) control using what we described above is known as ARQ, or 'Automatic Repeat Request'. In ARQ, when we have a 'bad' package, the system simply discards it, and asks for a retransmission (of the same package). And for this, it sends a feedback message to the transmitter.