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"Nak" and "NAK" redirect here. For other uses, see Nak (disambiguation).
||It has been suggested that NAK (protocol message) be merged into this article. (Discuss) Proposed since June 2015.|
|This article relies largely or entirely upon a single source. (March 2012)|
- In telecommunications, a negative-acknowledge character (NAK or NACK) is a transmission control character sent by a station as a negative response to the station with which the connection has been set up.
- In Binary Synchronous Communications protocol, the NAK is used to indicate that an error was detected in the previously received block and that the receiver is ready to accept retransmission of that block.
- In multipoint systems, the NAK is used as the not-ready reply to a poll.
- This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).
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