What does a Firewall do? - Network Security Firewall

Step by step process flow of how firewalls work to protect your personal computer and private network from malicious mischief.

What is a Firewall and What does a Firewall do?

At their most basic, firewalls work like a filter between your computer/network and the Internet. You can program what you want to get out and what you want to get in. Everything else is not allowed. There are several different methods firewalls use to filter out information, and some are used in combination. These methods work at different layers of a network security firewall, which determines how specific the filtering options can be.

How does a Firewall Work?

Firewalls can be used in a number of ways to add security to your home or business.

How do Firewalls work to protect Businesses?

Large corporations often have very complex firewalls in place to protect their extensive networks.
On the outbound side, network security firewalls can be configured to prevent employees from sending certain types of emails or transmitting sensitive data outside of the network.
On the inbound side, firewalls can be programmed to prevent access to certain websites (like social networking sites).
Additionally, firewalls can prevent outside computers from accessing computers inside the network.
A company might choose to designate a single computer on the network for file sharing and all other computers could be restricted.
There is no limit to the variety of configurations that are possible when using network security firewalls.
Extensive configurations typically need to be handled and maintained by highly trained IT specialists, however.

The need for Firewalls for Personal Use

Computer Network Firewall protection

For home use, firewalls work much more simply.
The main goal of a personal firewall is to protect your personal computer and private network from malicious mischief.
Malware, the malicious software, is the primary threat to your home computer. Viruses are often the first type of malware that comes to mind. A virus can be transmitted to your computer through email or over the Internet and can quickly cause a lot of damage to your files. Other malware includes Trojan horse programs and spyware.
These malicious programs are usually designed to acquire your personal information for the purposes of identity theft of some kind.
There are two ways a network security Firewall can prevent this from happening.
It can allow all traffic to pass through except data that meets a predetermined set of criteria, or it can prohibit all traffic unless it meets a predetermined set of criteria.

Comodo Network Security Firewall

Comodo Firewall Security uses the latter way to prevent malware from installing on your computer. This free firewall software, from a leading global security solutions provider and certification authority, uses the patent-pending "Clean PC Mode" to prohibit any applications from being installed on your computer unless it meets one of two criteria. Those criteria are a) the user gives permission for the installation and b) the application is on an extensive list of approved applications provided by Comodo. With this feature, you don't have to worry about unauthorized programs installed on your computer without your knowledge.

Features of Comodo Network Security Firewall:

Comodo Network Security firewall is rated as a top firewall recommended for both beginners and advanced users. It has a number of unique features including
Host Intrusion Prevention System (HIPS)
Default Deny Protection
Auto Sandbox Technology
Personalized alerts
Cloud-based Behavior Analysis

This software is highly customizable so that you can adjust it to suit your specific needs.

Comodo Internet Security Suite combines the award-winning Comodo firewall security with a powerful antivirus to offer a multilayered approach to protecting millions of computers around the world for free.