Microsoft® Computer Dictionary

Chapter 15. N

n prefix

See nano- prefix.

NACN n.

See North American Cellular Network n..

nagware n.

Slang for computer shareware that, on starting or before closing, displays a prominent reminder to pay for the program. See also shareware n..

NAK n.

Acronym for negative acknowledgement. A control code, ASCII character 21 (hexadecimal 15), transmitted to a sending station or computer by the receiving unit as a signal that transmitted information has arrived incorrectly. Compare ACK.

NAK attack n.

Acronym for negative acknowledgement attack. A hacker attack that uses the negative acknowledgement control code character to enter a seemingly secure system. A NAK attack uses weaknesses in the system handling NAK replies that may leave it temporarily unprotected. ...