What is the primary function of a firewall in a network?

The primary function of a firewall in a network is to provide network security. Firewalls serve as a 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 filtering traffic, firewalls can prevent unauthorized access, protect sensitive data, and defend against various security threats, such as malware and hacking attempts.

This security functionality is essential in protecting an organization's information assets and maintaining the integrity and confidentiality of its data. Firewalls can be implemented in hardware, software, or a combination of both, and are a fundamental component in establishing a robust security posture for any networked environment.