What is the function of a firewall in a network?

The function of a firewall in a network is to monitor and control incoming and outgoing network traffic based on predefined security rules. Firewalls act as a barrier between trusted internal networks and untrusted external networks, such as the internet. They inspect data packets traveling in and out of the network, allowing or blocking traffic according to the set rules, which helps prevent unauthorized access, data breaches, and other security threats. By managing this traffic, firewalls ensure that only legitimate connections are made, enhancing the overall security of the network.

This role is crucial because as organizations face increasing cyber threats, having a robust method of controlling and monitoring network traffic is essential for maintaining data integrity and confidentiality. Firewalls can be hardware-based, software-based, or a combination of both, and they play a significant part in an organization's overall security posture.