Virtual Private Network
27 Aug 2008, 4:13 pm
Virtual private network (VPN) is a computer network in which some of the links between nodes are carried by open connection or virtuallines in some larger network instead of by physical wires. The link-layer protocols of the virtual network are said to be tunnelled through the larger network when this is the case. One common application is secure communications through the public Internet, but a VPN need not have explicit security features, such as authentication or content encryption. VPNs, for example, can be used to separate the traffic of different user communities over an underlying network with strong security features.
A VPN may have best-effort performance, or may have a defined service level agreement (SLA) between the VPN customer and the VPN service provider. Generally, a VPN has a topology more complex than point-to-point. The distinguishing characteristics of VPNs are not security or performance, but that they overlay other network(s) to provide a certain functionality that is meaningful to a user community.
Common uses for VPN are Business VOIP solutions applications between sites. Another common vpn setup is using the VPN to cross over onto an Business Ethernet Solution.
W.M
