Chapter 44. How Firewalls Work
Every time a computer is connected to the Internet, it faces potential danger. Corporate local area networks (LANs) connected to the Internet, as well as PCs at home—especially those connected to a high-speed cable modem or DSL modem—are likely targets for hackers.
Due to the Internet’s openness, every corporate network connected to it is vulnerable to attack. Crackers on the Internet could theoretically break into the corporate network and do harm in a number of ways: They could steal or damage important data; damage individual computers or the entire network; use the corporate computer’s resources; or ...
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