GA virtual private network is a network of virtual circuits that carry private traffic over a public network such as the Internet. VPNs can connect two or more LANS, or remote users to a LAN. VPNs provide privacy and security by requiring all users to authenticate and by encrypting all data traffic. Many network environments define HTTP proxies that connect a web browser to a particular network resource. The HTTP traffic can reach the network resource only if the proxy is specified in the browser and the client routes the HTTP traffic to the proxy.