Computer Networks Site
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Security: Firewalls
If you spend a lot of time on the internet and you are not behind a firewall, then you are living on borrowed time. Putting some protection between you and the internet is probably the third most important thing that you can do.

The Great Wall: The Firewall
Do you have a DSL or cable modem? If so, protecting your computer and personal data from malicious attacks should be a major concern. Let’s take a look at how a personal firewall can put your mind at ease.