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What is a firewall?

  As its name suggests (Fire wall: a wall constructed to prevent the spread of fire), a firewall is a system that protects internal computing resources from unauthorized access or use and allows to block specific traffic on the network.
  For your home computer, you may install a software-based firewall, such as ZoneAlarm.
Windows XP Users
  Windows XP users are recommended to install the Service Pack 2 and enable the built-in firewall.
  Macintosh Users
  Mac OS X has a built-in firewall. See how to enable this feature.

Last updated: by Computer Service Centre.