A firewall is a part of a computer system or network that is designed to block unauthorized access while permitting authorized communications. It is a device or set of devices which is configured to permit or deny computer applications based upon a set of rules and other criteria.
Firewalls can be implemented in either hardware or software, or a combination of both. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets. All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.
When a computer connects to a network and begins communicating with other computers, it is essentially taking a risk. Internet security involves the protection of a computer's Internet account and files from intrusion of an unknown user. Basic security measures involve protection by well selected passwords, change of file permissions and back up of computer's data.
Security concerns are in some ways peripheral to normal business working, but serve to highlight just how important it is that business users feel confident when using IT systems. Security will probably always be high on the IT agenda simply because cyber criminals know that a successful attack can be very profitable. This means they will always strive to find new ways to circumvent IT security, and users will consequently need to be continually vigilant. Whenever decisions need to be made about how to enhance a system, security will need to be held uppermost among its requirements.
Internet security professionals should be fluent in the four major aspects:
- Penetration testing
- Intrusion Detection
- Incidence Response
- Legal / Audit Compliance
Internet Security / Firewall
Norton 360 2013 Beta
Norton Internet Security 2013 Beta
Lavasoft Ad-Aware Free Internet Security 9.6.0
Comodo Internet Security 6.3.291162.2907 Beta
PC Tools Internet Security 2012 22.214.171.1248
Emsisoft Online Armor Firewall 126.96.36.1996
ZoneAlarm Free Antivirus + Firewall 10.2.074
*All sources/products linked on this site are/may be trademarks and/or registered trademarks of their respective companies in the United States and/or other countries and/or protected by US and/or International laws.
Some sources/products are alpha, beta, demo, trail, preview release, release candidate that not supported by their respective companies and this site, use on your own risk!