July 2012
Intermediate to advanced
700 pages
18h 24m
English
Content preview from CCNA Security 640-554 Official Cert Guide
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Chapter 12. Understanding Firewall Fundamentals
This chapter covers the following subjects:
• Firewall concepts and technologies
A firewall in a race car is designed to separate the engine compartment from the driver so that in the event of a problem the driver can be protected from what goes on in the engine compartment. A firewall on a computer network is very much the same concept, and that is to separate one portion of the network from another.
Complete separation means that no network connectivity exists, which does not serve anyone very well. By allowing specific traffic through the firewall, you can implement a balance of the required connectivity and security. Traffic ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.