They already likely have a powerful private network within their firewalls. What VPNs do is extend that network to customers and suppliers. VPNs are all about communicating and making the most of centralized resources. Applications sit on central servers and are accessed at the desktop level through an internal network. Private networks allow branch operations, road warriors, suppliers and customers to easily and instantly access that centrally stored information and services in a secure fashion.
Cost is an absolute factor.
They can be layered on existing networks or you can outsource them through an Internet service provider. Despite their growing popularity, VPNs, like any new technology, pose challenges for those creating, installing and using them. His company creates solutions in all three areas. Access is a critical piece of the VPN puzzle. Users and recipients of information moved on a VPN must be authorized.