Definition
An Internet-based virtual private network (VPN) uses the open, distributed infrastructure of the Internet to transmit data between corporate sites.
Why to develop vpn ?
Businesses today are faced with supporting a broader variety of communications among a wider range of sites even as they seek to reduce the cost of their communications infrastructure.
Employees are looking to access the resources of their corporate intranets as they take to the road, telecommute, or dial in from customer sites.
Plus business partners are joining together in extranets to share business information, either for a joint project of a few months' duration or for long-term strategic advantage.
At the same time, businesses are finding that past solutions to wide-area networking between the main corporate network and branch offices, such as dedicated leased lines or frame-relay circuits, do not provide the flexibility required for quickly creating new partner links or supporting project teams in the field.
Meanwhile, the growth of the number of telecommuters and an increasingly mobile sales force is eating up resources as more money is spent on modem banks, remote-access servers, and phone charges.
The trend toward mobile connectivity shows no sign of abating; Forrester Research estimated that more than 80 percent of the corporate workforce would have at least one mobile computing device by 1999.
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