In fact, the virtual network is not a private network, but the virtual network can establish its own dedicated network channel on the public network, and through the use of data communication network technology, to achieve the encryption of the communication process. VPN Virtual network can maximize the user's needs, through the use of long-distance data lines, for themselves to build a network that best meets the needs. Therefore, the use of VPN virtual private network can effectively speed up the user's network access speed. VPN is a temporary establishment of a secure, dedicated virtual network, users at the network level can be completely at ease to use, only pay a certain amount of internet fees can be exempt from a series of unnecessary additional expenses. Users do not need leased line, effectively save a lot of operating costs, and can save a large number of long-distance telephone charges. That, too, is what makes the VPN affordable.