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Start here for CCIE CCNA CCNP CCVP Certification
Here's how Certification Zone helps you to prepare for and pass the Cisco® CCNA™, and CCIE™ certification exams.
(For CCNP™ and CCVP™ exam assistance, visit our Tutorials page.)
What's New

Routing Principles ZoneCast
With the release of two new presentations, the audio presentation series on Routing Principles at the CCIE level is now complete. The first new presentation (Part II) covers packet forwarding and that is followed by an audio quiz on the topic. Previously released was an audio presentation on path determination (Part I).

Gateway/Gatekeeper Study Guides
The addition of a Study Quiz and a Lab Scenario completes the Gateway/Gatekeeper Configuration, Part 2 Study Guide. This second GWGK Study Guide focuses on Gatekeepers. The Part 1 GWGK Study Guide focuses on Gateways. When you're done with these two Study Guides you'll be able to design, configure, and deploy the Gateways and Gatekeepers required to meet specific VoIP requirements, and you'll have covered the topics on the CCVP Gateway Gatekeeper Exam no. 642-452.

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Concise, expert written overviews of CCIE, CCNP, CCVP, and CCNA blueprint topics you must master to pass Cisco's exams.
Study Quizzes
Sets of challenging CCIE, CCNP, CCVP, and CCNA certification
exam study questions sorted by certification level and exam topic.
Lab Scenarios
Router applications that help you prepare for the router simulation questions on Cisco's CCIE, CCNP, CCVP, and CCNA exams.
Practice Exams
Full-length practice tests that cover all the topics included on Cisco's CCIE, CCNP, and CCNA exam blueprints.
Personal Study Zone
Create your own personal CCIE or CCNA Study Plan, and try Certification Zone for free!
Downloadable audio lessons that address topics you must master to become Cisco certified.

Today's Focus:


The Tutorial portion of this Study Guide begins with a very brief overview of what a firewall is and the general functions available in most common firewalls. It then discusses firewall features available in the current (12.x) releases of IOS, gives some general guidelines for "hardening" a router so that it can act as a firewall, and examines the four major IOS enhancements that make up Cisco's Secure Integrated Software (formerly called the "IOS Firewall Feature Set"). The Tutorial concludes with an examination of the features of the PIX, Cisco's...
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