User:Adolphussa

　　Virtual private network (Virtual Private Network, the VPN for short) refers to is in the public network to establish a private network technology. Is called a virtual network, mainly because of the connection between any two nodes of the entire VPN network and the traditional private network required for end-to-end physical link, but the network architecture in the public network service providers platforms, such as the Internet, ATM (Asynchronous Transfer Mode> Frame Relay (FR), on top of the logic network, the user data transmission in a logical link. it covers a package of cross-sharing networks or public networks, encryption and authentication private network, a validation link extension. VPN mainly uses tunneling technology, encryption technology, key management and user and device authentication.

　　VPN are remote access technology, it simply is the use of public network links set up a private network. For example, company employees travel to the field, he would like to access the intranet server resources, such access is a remote access. How to make the field staff access to intranet resources? The VPN solution including network set up a VPN server, VPN server with two NICs, a connection within the network, a connection to the public network. Connected to the Internet in the local field staff, via the Internet to find VPN server, and then use the VPN server as a springboard into the intranet. In order to ensure communication between the data in the data security and VPN server and client are encrypted. With data encryption, that data is on a dedicated data link for secure transmission, just as dedicated to erect a private network. But in fact the VPN use is a public link on the Internet, and therefore can only be called a virtual private network. Namely: VPN is essentially the use of encryption technology to encapsulate a data communication tunnel over the public. With VPN technology, users both in the field of business or home office, as long as the Internet will be able to use VPN is very easy access to internal network resources, which is why VPN in the enterprise application so widely.