Installing a Firewall - Step by Step

Firewalls protect your computer when using DSL or a cable modem from a greater risks. Why? A dial-up modem uses a different network address every time it connects to the Web so it is a moving target. DSL or cable connections use a network address that doesn't change. A firewall helps obscure your network address, even though it always stays the same. If your computer is always connected to the Internet, your computer's network address is even more available to hackers. There is also a risk from "sharing the wire;" people in your neighborhood who have the same cable service could potentially trespass on your computer. A firewall can help protect your computer in such instances. 

Why would someone hack my computer? In addition to gaining access information such as financial records or password files, intruders can—and do—use individuals' computers to:

1.      Attack a high profile website. After gaining control of a computer, the hacker can direct your computer and hundreds or thousands of other computers to act simultaneously, which overloads and effectively shuts down the site. This is known as a Denial of Service (DoS) attack.

2.      Distribute software illegally. After appropriating space on your hard drive, a hacker can enable others to access your computer to download pirated entertainment or business applications.