|  There are a number of resources available for IPSec, and as you noticed, there are a lot of terms and definitions. The Cisco Internetworking Terms and Acronyms page is a good place to start at http://www.cisco.com/univercd/cc/td/doc/cisintwk/ita/.
A good and definitive source of information is always the RFCs, even if they aren't much of a read. See the RFCs for IPSec at http://www.cis.ohio-state.edu/cgi-bin/rfc/rfc2401.html. Read the RFCs for AH at http://www.cis.ohio-state.edu/cgi-bin/rfc/rfc2402.html. Read the RFCs for ESP at http://www.cis.ohio-state.edu/cgi-bin/rfc/rfc2406.html. Read the RFCs for ISAKMP at http://www.cis.ohio-state.edu/cgi-bin/rfc/rfc2408.html. Read the RFCs for IKE at http://www.cis.ohio-state.edu/cgi-bin/rfc/rfc2409.html. The IETF, as you would expect (there is a charge), has a large amount of information on IPSec at http://www.ietf.org/html.charters/ipsec-charter.html. Of course, you can do a search on the Cisco site to get all sorts of Cisco-specific examples, configurations, and solutions; visit http://www.cisco.com. | 