Guide Note

Firewalls are software or hardware programs that filter network traffic to block malicious activities.

Fast Facts

1. Can be embedded in hardware (usually in a router) or available as software
2. Usually filter both inbound and outbound activity
3. Hides your computer from Port Scanners
4. Can be shut down by Malware

History

The first firewall technology was developed in the 1980s by programmers at Cisco and AT&T; Bell Laboratories. The first commercial product appeared in 1985, and has been advanced every several years since with new technology.

Options

A variety of firewalls are available for download, both free and otherwise. Two popular and well-reviewed free options are ZoneAlarm Free Firewall and Comodo Personal Firewall—the latter of which CNET has called the "easiest to use and best" on the market. ZoneAlarm also offers an upgraded retail version, the ZoneAlarm Pro. Others include Lavasoft Personal Firewall and Sunbelt Personal Firewall, both available in free and retail versions.

Internet Security Suites

Internet Security Suites are bundled software packages that combine firewalls with other online protection, such as anti-virus, anti-phishing, anti-spyware and parental control features. Popular and acclaimed suites include ZoneAlarm I.S., BitDefender I.S. and Kapersky I.S.