What is the primary function of a firewall?

The primary function of a firewall is to prevent unauthorized access to or from a network. Firewalls act as a security barrier between trusted internal networks and untrusted external networks, such as the Internet. They monitor and control incoming and outgoing network traffic based on predetermined security rules. By analyzing the data packets and applying these rules, firewalls help to block malicious traffic, intrusion attempts, and unwanted communications that could harm the network or compromise sensitive information.

This critical function of blocking unauthorized access is essential in maintaining network security and integrity. While storing data securely, boosting network performance, and connecting multiple networks are important aspects of networking, they do not represent the primary role of a firewall, which is fundamentally focused on safeguarding the network.