address block

A group of contiguous addresses that can be expressed with a single network address and a subnet mask. An example of an address block is /26.


The process of tracking the age of resource records in a zone.

application directory partition

A partition in Active Directory that is reserved for use with a specific application, such as DNS. In Windows Server 2003, Windows Server 2008, and Windows Server 2008 R2, domain controllers that are DNS servers include two application directory partitions by default: DomainDnsZones and ForestDnsZones.

Authentication Header (AH)

The security protocol in IPsec that ensures data authentication and integrity.

Authoritative server

A DNS server that contains complete information about ...

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