In networking, an administrative domain is a collection of networks, routers, systems, and policies controlled by the same organization or administrative authority. It defines the boundary within which one group manages routing, security, addressing, access rules, and other network operations.

For example, a university, cloud provider, ISP, or large company might operate its own administrative domain. Inside that domain, administrators can decide which routing protocols to use, how traffic is filtered, how IP addresses are assigned, and what security policies apply. Once traffic crosses into another organization’s network, it has crossed an administrative boundary and may be subject to a completely different set of rules.

A major networking example is an Autonomous System (AS). An AS is essentially a routing-oriented administrative domain identified by an Autonomous System Number (ASN). Routers inside an AS commonly use an Interior Gateway Protocol, such as OSPF or IS-IS, while communication between autonomous systems primarily uses BGP.

A simple way to picture it is:

Administrative Domain A
Company Network
 ├─ Router
 ├─ Switches
 ├─ Servers
 └─ Internal routing
        │
        │ BGP / external connection
        ▼
Administrative Domain B
ISP / Cloud Provider
 ├─ Routers
 ├─ Networks
 └─ Different policies

The important distinction is that an administrative domain is about control and authority, not necessarily one physical location. A company could have offices and data centers across several countries while still managing them as part of the same administrative domain.

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