What is the primary function of a firewall?

The primary function of a firewall is to filter information coming from the internet. A firewall acts as a security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. By doing so, it serves as a barrier that can block unauthorized access while allowing legitimate traffic to pass through. This functionality is crucial in protecting networks from various types of cyber threats, such as unauthorized access attempts, malware, and other vulnerabilities.

The role of a firewall is fundamental in network security architecture, as it helps ensure that harmful data does not enter a network and that sensitive information remains protected. In summary, its main objective is to manage the flow of data to safeguard the integrity of the network.