| slovo | definícia |
negative acknowledgement
(foldoc) | negative acknowledgement
1. (NAK) The mnemonic for ASCII character 21.
Sometimes used as the response to receipt of a corrupted
packet of information.
Opposite of acknowledgement.
2. (NAK) Any message transmitted to indicate
that some data has been received incorrectly, for example it
may have a checksum or message length error. A NAK message
allows the sender to distinguish a message which has been
received in a corrupted state from one which is not received
at all.
An alternative is to use only ACK messages, in which case
the non-receipt of an ACK after a certain time is counted as a
NAK but gives no information about the integrity of the
communications channel.
See also ACK.
(1997-01-07)
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