Network Access Control Function

1. Negative-Acknowledge Character,
2. Negative Acknowledgement.

Deprecated term. See dedicated circuit, permanent virtual circuit.

Acronym for negative-acknowledge character.

In communications security systems, a security penetration technique that makes use of the negative-acknowledge transmission-control character and capitalizes on a potential weakness in a system that handles asynchronous transmission interruption in such a manner that the system is in an unprotected state against unauthorized access during certain periods. [From Weik '89]

With respect to Internet addressing, an entity responsible for the allocation of names.
Note: Such naming is typically hierarchical, so that the authority to allocate domain names is restricted to a particular level within a domain, such as ". com", ". net", or ". gov".

North American Number Plan

Consists of the United States, Canada and the Caribbean countries: Anguilla, Antigua, Bahamas, Barbados, Bermuda, British Virgin Islands, Canada, Cayman Islands, Dominica, Dominican Republic, Grenada, Jamaica, Montserrat, St. Kitts & Nevis, St. Lucia, St. Vincent & Grenadines, Turks & Caicos Islands, Trinidad & Tobago, and U. S. Caribbean territories (including American Samoa, Puerto Rico, the U. S. Virgin Islands, Guam… (Read More →)

North American Number Plan Administration

NANPA holds overall responsibility for the neutral administration of NANP numbering resources, subject to directives from regulatory authorities in the countries that share the NANP. NANPA's responsibilities include assignment of NANP resources, and, in the U. S. and its territories, coordination of area code relief planning and collection of utilization and forecast data.