Network Security, Firewalls, and VPNs

Chapter 14. Real-World VPNs

VIRTUAL PRIVATE NETWORKS (VPN) are a key technology and 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 your 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 usually 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 ...