Why you should use a computer firewall
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If you connect to the Internet without a firewall, it’s like leaving the keys in your car with the engine on and the doors unlocked while you run into the store. Although you might be able to get in and out before anyone notices, someone might take advantage of the opportunity. On the Internet, hackers use malicious code—such as viruses, worms, and Trojan horses—to try to find unprotected computers. A firewall can help protect your computer against these and other security attacks.
So what can a hacker do? It depends on the nature of the attack. While some attacks are just nuisances that play simple pranks, others are created with malicious intent. These more severe strains might attempt to delete information from your computer, crash it, or even steal personal information, such as passwords or credit card numbers. Some hackers just like to break into vulnerable computers. Viruses, worms, and Trojan horses are scary. Fortunately, you can reduce your risk of infection by using a firewall.
On This Page
 | How do I choose a firewall? |
| Windows Firewall (Windows XP Service Pack 2 only) |
| Software firewalls |
| Hardware routers |
| Wireless routers |
| Next step: Start to use a firewall today |
How do I choose a firewall?
A firewall examines information comes from and goes to the Internet. It identifies and ignores information that comes from a dangerous location or seems suspicious. If you set up your firewall properly, hackers who search for vulnerable computers can't detect your computer.
There are three basic types of firewalls available today. The first step when you choose a firewall is to determine which one is best for you. Your options include:
| • | Software firewalls |
| • | Hardware routers |
| • | Wireless routers |
To get started, answer these questions and record your answers:
1. | How many computers will use the firewall? |
2. | What operating system do you use? (This might be a version of Microsoft Windows®, Apple Macintosh, or Linux.) |
That's it. You are now ready to start thinking about what type of firewall you would like to use. There are several options, each with its own pros and cons.
Windows Firewall (Windows XP Service Pack 2 only)
If you use Window XP Service Pack 2 (SP2), the most updated version of Windows XP, you have a firewall built-in and turned on by default. To learn more about the Windows Firewall that comes with Windows XP SP2, read Understanding Windows Firewall.
Tip: If you haven't downloaded Service Pack 2, visit our Protect Your PC section to learn how to get it.
If you use Windows XP and you choose not to download Service Pack 2, you'll still have access to the Internet Connection Firewall (ICF) that's built into Windows XP, but you'll need to turn it on. For more information see Use the Internet Connection Firewall.
Note: The Windows Firewall and the Internet Connection Firewall are not available as a stand-alone package. They are also not available for other operating systems (for example, Apple Macintosh or Linux) or for versions of Windows other than Windows XP.
Software firewalls
Software firewalls are a good choice for single computers, and they work well with Windows 98, Windows ME, and Windows 2000. (Windows XP has a built-in firewall, so an additional firewall is not necessary.)
Software firewalls are available from other software companies. For special offers on antivirus and firewall packages, visit our Security software: Downloads and trials page.
| Pros | Cons |
Does not require additional hardware. | Additional cost: Most software firewalls cost money. |
Does not require additional computer wiring. | Installation and configuration may be required to get started. |
A good option for single computers. | One copy is typically required for each computer. |
Hardware routers
Hardware routers are a good choice for a home network that is connected to the Internet.
| Pros | Cons |
Hardware routers usually have at least four network ports to connect other computers together. | Requires wiring, which can clutter your desktop area. |
Hardware routers provide firewall protection for multiple computers. |
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Wireless routers
If you have or you plan to use a wireless network, you need a wireless router. Only a few wireless routers come equipped with a built-in firewall, so you might need to purchase a firewall separately.
| Pros | Cons |
Wireless routers allow you to connect computers, portable computers, personal desk assistants, and printers without wires. | Wireless devices broadcast information using radio signals that can be intercepted by someone outside of your home (with the right equipment). |
Wireless routers are excellent for connecting notebook computers to the Internet and networks. | Using a wireless router requires you to use a wireless adapter in any computer that connects to it. Therefore, you might have to pay for extra equipment. |
| Not all wireless routers come equipped with a built-in firewall, so you might have to purchase one separately. |
Next step: Start to use a firewall today
A connection to the Internet can create dangers for the unaware computer user. If you use a firewall, you can help reduce your risk. A firewall is just the first step toward safer surfing online. You can continue to improve your computer's security if you keep your software up to date and you maintain a current antivirus software subscription. Learn more about the first three steps you can take to help protect your PC.
