Networking protocols divide data into smaller data packets before transmitting. A network firewall examines these packets to identify anything dangerous to your network.

In addition to protecting your computer from traffic coming into your system, a two-way firewall also protects sensitive data from leaving your computer system. This provides incoming and outgoing protection, sometimes referred to as perimeter protection.

Other types of firewalls exist that provide internal protection, such as web application firewalls. We will only explore network firewalls in this article.

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