![]() ![]() Please help improve this section by adding citations to reliable sources. ![]() ![]() Most often, when checksums are employed, a corrupted message received will either not be served an ACK signal, or will be served a NAK signal. If a message is received with an invalid checksum (that is, the data received would have a different checksum than the message had), the receiver can know that some information was corrupted. Checksums are used to detect data corruption. Many protocols contain checksums to verify the integrity of the payload and header. Acknowledgments and negative acknowledgments inform a sender of the receiver's state so that it can adjust its own state accordingly. The negative-acknowledgement ( NAK or NACK ) is a signal that is sent to reject a previously received message or to indicate some kind of error. 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. For other uses, see Nak (disambiguation) and Nack (disambiguation). ![]()
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