Want To Explore Firewall ..Here Are The Books

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If you want to understand more advanced concepts and detail about firewalls, there are lots of resources available.
The first edition of the classic Cheswick and Bellovin book Firewalls and Internet Security: Repelling the Wily Hacker is available in its entirety for free online.
Some sample chapters from the second edition are available:

• Chapter 2 - A Security Review of Protocols: Lower Layers
• Chapter 3 - Security Review: The Upper Layers
• Appendix B - Keeping Up

Free chapters from other books:

• Practical Unix and Internet Security, Third Edition: Chapter 11 TCP/IP Networks
• Building Internet Firewalls, Second Edition: Chapter 13 Internet Services and Firewalls
• Linux Network Administrator's Guide, 2nd Edition: Chapter 9 TCP/IP Firewall
• Network Security: Private Communication in a Public World, 2nd Ed.: Chapter 1

For a good general overview of computer and network security, I highly recommend the book Secrets and Lies by Bruce Schneier. Go to the library (note for Internet users: large quiet building filled with books - most towns have one) and borrow it. Or even buy it. The book webpage has some excerpts.

For Further Reading,

Articles, E-Books