VIRTUAL PRIVATE NETWORKS (VPNs) allow organizations to transmit private and sensitive data securely over public intermediary networks. The Internet can serve as an inexpensive long-distance carrier for wide area network (WAN) connections established using VPNs. VPNs use native operating system (OS) features or third-party software, as well as hardware devices, including edge routers, firewalls, and VPN appliances. Remote access for mobile users, linked multi-office intranets, and secured access into an extranet are common VPN architecture solutions.

The use of VPNs on networks ranging from SOHO (small office/home office) networks to corporate global networks has dramatically expanded the ways people connect and do their work. VPNs allow remote employees, business partners, traveling workers, suppliers, distributors, and others to benefit from secured connectivity while geographically distant. With a basic understanding of VPNs, you can begin designing and planning your own VPN solution.