Cisco ASA Firewall Fundamentals
3rd Edition
by Harris Andrea

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This ones a great read for anyone first getting into ASA firewalls. Its a short book (about 150 pages) but goes through all the most common tasks one would do administering a firewall. Once you get your feet wet with this one, go to the Cisco Press Cisco ASA 3rd edition book (alot more detailed than this one). Great for a quick review for veterans.

CCNA Security Official Cert Guide
by Keith Barker & Scott Morris

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