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・ nds
・ ne
・ neat hack
・ neats vs. scruffies
・ nebula
・ nec
・ nec 780-c
・ needs assessment
・ neep-neep
・ negation by failure
negative acknowledgement
・ neliac
・ neon
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・ nerd pride
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・ nested class
・ net


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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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