Chapter 2. IPSec Overview

Chapter 1, “Introduction to VPNs,” introduced VPN concepts at a high level and presented an overview of several technologies that use VPNs. In this chapter, you will explore the building blocks of an IPSec VPN and obtain an understanding of IPSec architecture and how the various components of IPSec interact with each other to create a VPN. You will also look at some Cisco-specific IPSec implementation details and how IPSec packet processing is performed on Cisco IOS platforms.

A common misconception about IPSec is that it is a single protocol for providing these security services for IP traffic. In fact, IPSec is really a suite, or collection, of protocols for security defined by the IPSec working group in the IETF. The ...

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