Terms you'll need to understand:
Techniques you'll need to master:
Before the innovation of virtual private networks (VPNs), companies had no choice but to purchase expensive wide area network (WAN) connections to interlink sites or allow users access into their networks. These days, companies and home users alike can use VPNs to access network resources ”not by traveling across dedicated WAN links, but by using public media such as the Internet. This chapter contains a high-level overview of VPN technology and discusses VPN functionality provided by the PIX firewall.