Virtual Private Network (VPN)

A virtual private network (VPN) extends a private network across a public network, such as the Internet. It enables a computer to send and receive data across shared or public networks as if it is directly connected to the private network, while benefiting from the functionality, security and management policies of the private network.A VPN is created by establishing a virtual point-to-point connection through the use of dedicated connections, virtual tunneling protocols, or traffic encryptions.

A virtual private network connection across the Internet is similar to a wide area network (WAN) link between sites. From a user perspective, the extended network resources are accessed in the same way as resources available within the private network.Continue Reading...

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Virtual Private Network (VPN)Books
Virtual Private Networks By Charlie Scott, Paul Wolfe, Mike ErwinVirtual Private Networks:
Making the Right Connection By Dennis Fowler
Building and Managing Virtual Private NetworksVirtual Private Networking: 
A Construction, Operation and Utilization Guide By Gilbert Held