VIRTUAL PRIVATE NETWORKS (VPNs) are a key technology component in today’s computer security environment. Recall that the Internet is open to virtually any user, while an intranet is open only to individuals within the organization. A third kind of network is the extranet. Extranets lie somewhere between the Internet and an intranet.

Companies use extranets to connect with suppliers and customers, two constituencies that are essential to business processes. Extranets often use VPN technology to ensure confidentiality and integrity of information. VPNs are becoming an increasingly important component of any successful business’s information technology plan. VPNs can substantially enhance the technological architecture of any organization’s network through the use of efficient and flexible collaborative technology.

In this chapter, you will learn how to plan a complete VPN installation at your organization, from operating systems (OSs) and VPN appliances to remote desktops.