After completing this chapter, you will be able to
Identify Virtual Private Network (VPN) technologies
Design site-to-site VPNs
Design remote-access VPNs
Virtual private networks (VPNs) are networks deployed on a public or private network infrastructure. VPNs are useful for telecommuters, mobile users, and remote offices as well as for customers, suppliers, and partners.
For enterprises, VPNs are an alternative wide-area network (WAN) infrastructure, replacing or augmenting existing private networks that use dedicated WANs based on leased-line, Frame Relay, Asynchronous Transfer Mode (ATM), or other technologies. Increasingly, enterprises are turning to their service providers for VPNs and other complete ...