Chapter 9. Kinds of Firewalls
fire wall noun: A fireproof wall used as a barrier to prevent the spread of a fire. | ||
| --AMERICAN HERITAGE DICTIONARY | ||
Some people define a firewall as a specific box designed to filter Internet traffic—something you buy or build. But you may already have a firewall. Most routers incorporate simple packet filters; depending on your security, such a filter may be all you need. If nothing else, a router can be part of a total firewall system—firewalls need not be one simple box.
We think a firewall is any device, software, or arrangement or equipment that limits network access. It can be a box that you buy or build, or a software layer in something else. Today, firewalls come “for free” inside many devices: routers, modems, ...
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