NAK
negative acknowledgment. Response sent from a receiving device to a sending device indicating that the information received contained errors.
name server
Server connected to a network that resolves network names into network addresses.
NAS
network access server. A platform (or collection of platforms, such as an AccessPath [...]

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MAC
Media Access Control. Lower of the two sublayers of the data link layer defined by the IEEE. The MAC sublayer handles access to shared media, such as whether token passing or contention will be used.
MAC address
Standardized data link layer address that is required for every port or device that [...]

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