Chapter 6. Virtual Private Networks

Virtual private networks (VPNs) provide a means of accessing a private network over a shared public network such as the Internet. Access to the private network is provided via an encrypted tunnel, and connecting to the network in such a way emulates a point-to-point link between the remote node and the network. Since the tunnel is encrypted, any packets that are intercepted are indecipherable without the encryption keys. Thus, VPNs provide a secure means of accessing a private network remotely.

Prior to the advent of VPNs, the only way of providing remote connections to a private network was through private WAN circuits. These circuits provided point-to-point dedicated circuits, and were based on such technologies ...

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