O'Reilly logo

Network Security Principles and Practices by Saadat Malik

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Firewalls

The term firewall has many definitions in the industry. The definition depends on how and to what extent a firewall is used in a network. Generally, a firewall is a network device that, based on a defined network policy, implements access control for a network.

Apart from doing this basic job, firewalls are often used as network address translating devices, because they often tend to sit on the edge of a network and serve as entry points into the network. Figure 7-1 shows the basic philosophy of a firewall setup.

Figure 7-1. Basic Firewall Philosophy

Some important characteristics distinguish a serious, industrial-strength firewall from ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required