Acknowledgement (data networks)
Signal confirming receipt of a message without errors / From Wikipedia, the free encyclopedia
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"Nak", "NAK", and "NACK" redirect here. For other uses, see Nak (disambiguation) and Nack (disambiguation).
In data networking, telecommunications, and computer buses, an acknowledgment (ACK) is a signal that is passed between communicating processes, computers, or devices to signify acknowledgment, or receipt of message, as part of a communications protocol. Correspondingly an negative-acknowledgement (NAK or NACK[1]) is a signal that is sent to reject a previously received message or to indicate some kind of error. Acknowledgments and negative acknowledgments inform a sender of the receiver's state so that it can adjust its own state accordingly.