Thanks a lot for the reply. Actually, I was looking for some good links so that I can start understanding from scratch. The links what you have forwarded are good but I already have those with me. Let me know if you have any more links.
Have a look at http://www.cisco.com/en/US/netsol/ns577/networking_solutions_solution.html
there are white papers, case studies, and loads more information. Hope this helps.