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9.3. The Firewall

If you have a broadband, always-on connection, you're connected to the Internet 24 hours a day. It's theoretically possible—although very unlikely—for some cretin to use automated hacking software to take control of your machine.

If your Mac is connected to a router as described on Section 5.2, its firewall circuitry is probably protecting you. If not, Mac OS X's firewall software can put up a simpler, but effective, barrier.


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