Firewall software is also available separately from your local computer store, software vendor, or ISP.

Software - Most operating systems (OSs) include a built-in firewall feature that you should enable for added protection, even if you have an external firewall.

The disadvantage is that they are separate devices that require trained professionals to support their configuration and maintenance. The advantage of hardware-based firewalls is that they provide an additional line of defense against attacks reaching desktop computing systems.

Hardware-based firewalls are particularly useful for protecting multiple computers and controlling the network activity that attempts to pass through them. Many vendors and some internet service providers (ISPs) offer integrated small office / home office routers that also include firewall features.

Hardware - Typically called network firewalls, these physical devices are positioned between your computer and the internet (or other network connection).

While both have advantages and disadvantages, the decision to use a firewall is more important than deciding which type you use. (See Understanding Denial-of-Service Attacks for more information.)Ĭategories of firewalls include hardware and software. Firewalls can be configured to block data from certain locations (i.e., computer network addresses), applications, or ports while allowing relevant and necessary data through. Firewalls can also prevent malicious software from accessing a computer or network via the internet. However, you can restrict outside access to your computer-and the information on it-with a firewall.įirewalls provide protection against outside cyber attackers by shielding your computer or network from malicious or unnecessary network traffic. When your computer is accessible through an internet connection or Wi-Fi network, it is susceptible to attack.

Home firewall