- An Extranet is a variation of intranet, where member nodes of the network may be under the control of different administrative domains, but still hidden from the public internet.
- An Extranet is therefore still a private network, but branches of the extranet may be served by different ISPs.
- Example: An enterprise network spread across multiple cities, with different ISPs connecting these branches.
The diagram given below illustrates an Extranet of an organization with multiple branches:
In the example, ISP1 connects the main branch and Branch office1, whereas ISP2 connects the main branch and Branch office2.