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CompTIA Security+ All-in-One Exam Guide, Third Edition by Chuck Cothren, Roger Davis, Dwayne Williams, Gregory White, Wm. Arthur Conklin

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IPsec

IPsec is a set of protocols developed by the IETF to securely exchange packets at the network layer (layer 3) of the OSI model (RFC 2401–2412). Although these protocols work only in conjunction with IP networks, once an IPsec connection is established, it is possible to tunnel across other networks at lower levels of the OSI model. The set of security services provided by IPsec occurs at the network layer of the OSI model, so higher layer protocols, such as TCP, UDP, Internet Control Message Protocol (ICMP), Border Gateway Protocol (BGP), and the like, are not functionally altered by the implementation of IPsec services.

The IPsec protocol series has a sweeping array of services it is designed to provide, including but not limited to access ...

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