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A firewall acts as a barrier between your PC and the Internet.
Firewalls not only prevent unauthorized access to your PC or network,
they also hide your Internet-connected PC from view.Firewalls have long
been a fixture at organizations, which must secure their networks
against determined attackers. But the dangerous surge in e-mail- and
Web-borne threats--including viruses, worms, hijacks, and increasingly
aggressive spyware ...
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