What is VPN, what is the use of VPN

　　What is a VPN?

　　The English full name of the VPN is "virtual private network", translation comes from "The fictitious specialized network". As the name suggests, virtual private network we can understand him as a virtual out of the enterprise internal line.

This VPN's English full name is "Virtual private network", translates is "The fictitious private network". As the name suggests, the virtual private network we can understand him as a virtual enterprise internal line. He can pass a special encrypted protocol. Building a proprietary communication line between two or more corporate intranets that are connected to the Internet is like setting up a special line, but he doesn't really need to Laying cables and the like. This is like going to the Telecommunications Bureau to apply for a special line, but do not have to pay the cost of laying the line, also do not buy (router abbreviation) device (LAN commonly used in a device, can be very good to prevent ARP virus) and other hardware equipment. VPN technology is originally (router abbreviation) device (LAN commonly used a kind of equipment, can be very good to prevent the ARP virus has one of the important technologies, at present in the switch, firewall (this site is strongly recommended to use the rising firewall, how to use in this site anti-virus antivirus has a detailed introduction) equipment or WINDOWS2000 software (soft) also support the VPN function, in a word, the core of VPN is to use public network to establish virtual private network. A Virtual private network (VPN) is defined as a temporary, secure connection through a public network (usually the Internet), It's a secure, stable tunnel through a messy public network. The Virtual private network is an extension of the intranet. Virtual private networks can help remote users, corporate affiliates, business partners, and suppliers establish a trusted secure connection with the company's intranet and ensure data Secure transmission. The Virtual private network can be used for the increasing mobile users ' global Internet access to secure connection, and can be used to realize secure communication between the Enterprise website. A secure extranet virtual private network for cost-effective connectivity to business partners and users. Below we combine the site of Cisco and Microsoft on the VPN aspects of the article for you to introduce this information, More and richer relevant content we will supplement it in the days to come. For different user requirements, there are three solutions for VPN: Remote access virtual network (Access VPN), Enterprise internal virtual network (Intranet VPN) and enterprise Extended virtual network (Extranet VPN), These three types of VPNs correspond to the extranet (external extension) of the traditional Remote access network, intranet within the enterprise, and the Enterprise network of the Enterprise network and related partners.

　　What's the use of VPNs?

　　A Virtual private network (VPN) is defined as a temporary, secure connection through a public network (usually the Internet), a secure, stable tunnel through a chaotic public network. The virtual private network is an extension of the intranet of the enterprise.

A virtual private network can help remote users, corporate affiliates, business partners, and suppliers establish a trusted and secure connection with the company's intranet and secure data transmission. By moving data streams to low-cost pressure networks, an enterprise's virtual private network solution will significantly reduce the cost to users of both the metropolitan and Remote network connections. At the same time, this will simplify the design and management of the network and speed up the connection of new users and Web sites. In addition, the virtual private network can also protect existing network investment. As the user's business services evolve, the enterprise's Virtual private network solution allows users to focus on their business rather than on the web. Virtual private networks can be used for increasing mobile users ' global Internet access to secure connections, virtual private lanes that enable secure communication between corporate Web sites, and secure extranet networks that are economically and effectively connected to business partners and users.

At present, many units are faced with such a challenge: branch, distributors, partners, customers and foreign travel personnel require access to the company's resources at any time, such resources include: the company's internal information, Office OA, ERP system, CRM system, project management system. Many companies now secure connections between corporate headquarters and branch offices and mobile workers by using IPSec VPNs.