Network Security First-Step, Second Edition

VPN Overview

A VPN is an encrypted network connection that uses a secure tunnel between endpoints via the Internet or other network, such as a WAN. In a VPN, dial-up connections to remote users and leased-line or Frame Relay connections to remote sites are replaced by local connections to an Internet service provider (ISP) or other service provider’s Point of Presence (POP). The increasing prevalence of Internet broadband connections to small remote offices and homes makes the use of cheaper access to the Internet attractive. As discussed, after the initial investment in VPNs, the cost to add more sites or users is minimal.

VPNs enable each remote user of your network to communicate in a secure and reliable manner using the Internet as the medium ...