Firewall
A software utility or hardware device that limits outside network access to a computer or local network by blocking or restricting ports. Firewalls are a great step for helping prevent un-authorized access to a company or home network.
In the picture to the right, is a 3Com SuperStack 3 Firewall
and an example of what a hardware firewall may look like.
- Opening port for program or game in Windows Firewall.
- How do I disable the firewall program installed on my computer?
- How to prevent unauthorized computer access.
- Computer security questions and answers.
Also see: Application gateway, Network definitions, Port, Security definitions, SPI, Stateless