A Virtual Private Network (VPN) is defined loosely as a network in which customer
connectivity among multiple sites is deployed on a shared infrastructure with the same
access or security policies as a private network. With the recent advent of marketing
activities surrounding the term VPNs, from new technologies supporting VPNs to a flurry
of VPN-enabled products and services, you might think that the VPN concept is a major
technology throughput. However, as is often the case, VPN is a concept that is more than
10-years old and is well known in the service provider market space....