Chapter 15. Virtual Private Networks

This chapter covers the following subjects:

  • VPN Fundamentals: This section describes the main goals and benefits of VPNs.

  • IPsec VPNs: This section explains how the IP Security (IPsec) protocol architecture provides the main features needed in both site-to-site and access VPNs.

  • SSL VPNs: This final section examines the use of the Secure Socket Layer (SSL) protocol that is included in common web browsers today.

A company with one main site and ten remote sites could buy ten T1 lines, one each from the central site to each remote office. A more cost-effective solution would be to use Frame Relay. However, especially because the remote sites often need access to the Internet, it is even more cost effective to simply ...

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