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CCNP Routing and Switching Quick Reference (642-902, 642-813, 642-832) by Brent Stewart, Denise Donohue, - CCIE No. 9566

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Appendix A. Understanding IPsec

You are not required to have detailed knowledge of IPsec for the ROUTE exam. This Appendix is intended to help solidify your understanding of the technology. It can also serve as a command reference if you need to actually configure IPsec.

IPSecurity, or IPsec, is a set of rules for securing data communications across a public, untrusted network such as the Internet. It provides

• Data confidentiality by encrypting portions of a packet

• Data integrity by ensuring the packet has not been altered in transit

• Data source authentication to ensure the data originated with a trusted source

• Antireplay protection to ensure that packets are not copied and sent

IPsec standards do not specify exactly how packets ...

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