This category contains articles covering Cisco’s popular Advanced Security Appliances (ASA) 5500/5500x series and PIX Firewalls. Thanks to the structure of the Cisco ASA 5500 series software, almost all articles are applicable to all ASA5500 series appliances, including ASA5505, ASA5510, ASA5520, ASA5540, ASA5550 and ASA5580, ASA 5512-X, ASA 5515-X, ASA 5525-X, ASA 5545-X, ASA 5555-X.

The variety of topics provided include basic startup configuration, advanced configuration, NAT (PAT, Static, Dynamic and more), Firewalling – Access-lists, Firewall Management, Firewall redundancy, VPN client configuration, WebVPN (SSLVPN) configuration, software upgrades and much more.

We are continuously updating this section to provide the best up-to-date information for our readers.

We hope you enjoy the provided articles and welcome your feedback and suggestions.

The 'Cisco KnowledgeBase' section is one of the newest and most popular section on Firewall.cx. Dedicated to Cisco's leading technological inovations, this section offers articles covering multiple categories such Cisco Routers, Switches, Voice over IP and much more.

All articles are written by qualified engineers with years of experience and are complimented by our unique diagrams.

The quality of provided information is so high, readers can use it as a guideline for learning Cisco Technologies, but also for self-study exams.

We should note that Firewall.cx is only site, officially recommended by Cisco's Network Academy Program (see Site Related/Awards section), which confirms the validity of Firewall.cx and provided information.

Articles and examples provided in this section, cover the CCENT, CCNA, CCDA, CCNP & CCVP certification levels.

The Protocols section deals with various network protocols found in today's networks.  The aim of this section is to help understand the fundamentals of network protocols, how they work, where they are used and in which way they all work together to provide reliability and functionality for our applications, services and users.

Protocols such as TCP, IP, ICMP others are analysed in greater depth and therefore a dedicated sub-section has been provided, while other protocols are analysed on a single article with compromising its quality.