Firewall Computer Network Firewall

A computer network firewall protects or prohibits traffic flowing to and from the PC based on the administrator's setup. Firewalls can be either hardware firewalls or software firewalls.

A Software Firewall is a program that resides on the computer and filters traffic coming and going from the PC. Proper configuration is extremely important. A software firewall can become useless if not setup properly. A good example of a free software firewall is ZoneAlarm.

A typical hardware firewall is a router. The router uses Network Address Translation (NAT) to disguise the internal IP addresses of computers, making it more difficult to be seen from the Internet.

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