VPNs
VPNs are secure virtual networks built on top of physical networks. Their security lies in the encryption of packet contents between the endpoints that define the VPN network. The physical network upon which a VPN is built is typically a public network, such as the Internet. Because the packet contents between VPN endpoints are encrypted, to an outside observer on the public network, the communication is secure, and depending on how the VPN is set up, security can even extend to the two communicating parties’ machines.
Virtual private networking is not a protocol per se, but rather a method of using protocols to achieve a specific objective—secure communications—as shown in Figure 9-6. A user wanting to have a secure communication channel ...
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