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An Administrative Domain is

[a] collection of hosts and routers, and the interconnecting network(s), managed by a single administrative authority.[1]
a service security provider that holds security repositories and authenticates and authorizes clients with credentials safely and easily. An administrative domain may include a network of computers or a collection of networks and databases, which fall under a single common administration.[2]
[a]n environment or context that is defined by a security policy, security model, or security architecture.[3]


  1. RFC 1392, Internet Glossary (Jan. 1993).
  2. Technopedia (full-text).
  3. Symantec, Glossary (full-text).