VII Intranets, Extranets and Internets
In the networking world, people will sometimes describe the boundaries or scope of a network in terms of these concepts.
An internet (or internetwork) is a network of networks, which are connected together to facilitate sharing resources and information among users. The Internet is the most famous of all internetworks, but not the only one.
An intranet is a network that is specific to a single organization. This does not mean that the network resides physically only within the organization it can include wide area network links that use public networks like the Internet (and VPN technology for security!), as well as the main offices corporate LAN. The intranet is the network over which the companys staff shares information and computing resources with each other.
An extranet is a network that allows a business to connect with suppliers, vendors, customers, stockholders or others related to its business. Typically an extranet is run over the Internet, using a VPN for security. A companys extranet is usually situated around the borders of its intranet, allowing limited access to some corporate resources to those outside the corporation, on a need-to-know basis, and allowing corporate staff to access limited resources on other organizations networks.
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