What is the function of the firewall in a network?

The function of a firewall in a network primarily revolves around its role in monitoring and filtering incoming and outgoing network traffic. Firewalls serve as a barrier or a protective shield between a trusted internal network and untrusted external networks, such as the internet. By inspecting the data packets that enter or leave the network, firewalls can enforce security policies, allowing or blocking traffic based on predefined rules. This is crucial for preventing unauthorized access, protecting sensitive data, and defending against various cyber threats such as malware and hacking attempts.

Monitoring traffic also involves logging activities, which can help detect any suspicious behavior, and providing insights into how data flows in and out of the network. This essential function helps in maintaining the overall security posture of the network, making it indispensable in modern network design and management.