Home Articles FAQs XREF Games Software Instant Books BBS About FOLDOC RFCs Feedback Sitemap

negative acknowledgement

You are here: irt.org | FOLDOC | negative acknowledgement

1. <character> (NAK) The mnemonic for ASCII character 21.

Sometimes used as the response to receipt of a corrupted packet of information.

Opposite of acknowledgement.

2. <communications> (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.


Nearby terms: needs assessment « neep-neep « negation by failure « negative acknowledgement » neighborhood bike code » NELIAC » Neon

FOLDOC, Topics, A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, ?, ALL

©2018 Martin Webb