What is a 'Firewall'? How Does It Work?
Saturday September 20, 2008
You hear this fancy "firewall" term regularly at the office. The I.T. tech guys speak cryptically about how the company firewall stops hackers and viruses. But what exactly is a firewall? Does it actually resist burning and combustion? Our network security expert, Tony Bradley, explains firewalls here...
(image by Chung Sun-Jun / Getty Images)

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