1.4 Implement and use common protocols
There are literally thousands of protocols supported in the TCP/IP stack/suite. However, only a few of them are related to security, have native security features/benefits, and are included on the CompTIA Sec+ exam. The following material focuses on those protocols specified in the official Security+ 2011 objectives list.
Internet Protocol Security (IPSec) is both a stand-alone VPN protocol and a module that can be used with L2TP. You can use IPSec in dial-up or network-to-network connections. When it’s employed over dial-up, it usually functions as the encryption protocol in an L2TP link. IPSec by itself is more suitable for network-to-network connections across normal LAN connections, high-speed ...