Ccna routing and Switching Complete Study Guide

Encapsulating Security Payload (ESP)

It won’t tell you when or how the NASDAQ’s gonna bounce up and down like a superball, 

but ESP will provide confidentiality, data origin authentication, connectionless integrity, 

anti-replay service, and limited traffic-flow confidentiality by defeating traffic flow 

analysis—which is almost as good! Anyway, there are five components of ESP:

Confidentiality (encryption)    This allows the sending device to encrypt the packets before 

transmitting in order to prevent eavesdropping. Confidentiality is provided through the 

use of symmetric encryption algorithms like DES or 3DES. Confidentiality can be selected 

separately from all other services, but the confidentiality selected must be the same on both 

endpoints of your VPN.