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===Extranet===
An [[extranet]] is a network that is also under the administrative control of a single organization, but supports a limited connection to a specific external network.  For example, an organization may provide access to some aspects of its intranet to share data with its business partners or customers.  These other entities are not necessarily trusted from a security standpoint.  Network connection to an extranet is often, but not always, implemented via WAN technology.