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A VPN supplies network connectivity over a long physical distance. VPNs enable file sharing, video conferencing and similar network services. A key feature of a VPN is it's ability to work over both private networks as well as public networks like the Internet.

a VPN supports at least three different modes of use:

???Internet remote access client connections
???LAN-to-LAN internetworking
???Controlled access within an intranet

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