Virtual Private Networks
I'd be pretty willing to bet you've heard the term VPN more than once. Maybe you even know what one is, but just in case, a virtual private network (VPN) allows the creation of private networks across untrusted networks, enabling privacy and tunneling of non-TCP/IP protocols. Figure 9.2 shows the typical VPN network in use today.
VPNs are used daily to give remote users and disjointed networks connectivity over a public medium like the Internet instead of using more expensive permanent means. For example, instead of shelling out for a point-to-point connection between two sites (which is pretty secure in itself), you can use a less-expensive Internet connection to each site and then run a VPN tunnel between the sites. ...
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