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There are basically three types of VPN:
INTRANET: this type of VPN is usually implemented for commonly structured networks that may span various physical locations. An example would be a network that exists in several buildings connected to a data center or mainframe that has secure access through private lines. These may need strong encryption and strict performance and bandwidth requirements.
REMOTE ACCESS: Initiated by remote users to connect to their corporate LAN such as employees and telecommuters equipped with laptops that will connect intermittently from many different locations.
EXTRANET: This type of VPN uses the Internet as its base and deals with a wider scale of users and locations to allow customers and branch offices to access corporate resources across various network types.