GVPN

A private network configured within a public network such as the Internet or acarrier’s network. Years ago, virtual private networks (VPNs) obsoleted private lines between company branches. Using data encryption to maintain privacy, VPNs also allow mobile users access to the company LAN.

A Common carriers used their vast networks to “tunnel” traffic between customer locations to give the appearance of a private network while sharing backbone trunks, no different than the way the Internet works.