What is a VPN Server or a Virtual Private Network?
VPN or Virtual Private Network is a connection between a network with other networks privately through a public network (Internet). VPN Virtual network called because it uses the public network (Internet) as perantaranya alias rather than a direct connection. And it's called Private network because of its private nature, where only certain people can access them. Any data sent is encrypted so that it is secure and remain confidential though sent over public networks.
The workings of the VPN?
VPN corporate workings such as creating a network within a network or is usualy called tunneling (making the tunnel). Tunneling is a way to make connections in private by using other network infrastructure. The VPN is also basically requires a server and as a liaison between client Manager.