Virtual Private Networks
Several standards use encrypted tunnels between a computer or a remote network and a private network through the Internet (Figure 9.15), resulting in what is called a virtual private network (VPN).
FIGURE 9.15   VPN connecting computers across the United States
An encrypted tunnel requires endpoints—the ends of the tunnel where the data is encrypted and decrypted. In the tunnels you’ve seen thus far, the client for the application sits on one end and the server sits on the other. VPNs do exactly the same thing. Either some software running on a computer or, in some cases, a dedicated box must act as an endpoint for ...

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