Two or more networks or network segments associated using devices that operate at layer 3 (the 'network' layer) of the OSI Basic Reference Model, like a router. Any interconnection between or between public, commercial, private, industrial, or governmental networks may as well be defined as an internetwork.
In recent practice, the interconnected networks make use of the Internet Protocol. There are at least three variants of internetwork, dependent on who administers and who participates in them:
* Intranet
* Extranet
* Internet
Intranets and extranets might or might not have connections to the Internet. If attached to the Internet, the intranet or extranet is generally protected from being accessed from the Internet without correct authorization. The Internet is not considered to be a part of the intranet or extranet, even though it can serve as a portal for access to portions of an extranet.
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