What is the purpose of a firewall in network security?

The purpose of a firewall in network security is to control incoming and outgoing network traffic. This is accomplished by establishing a set of predetermined security rules. Firewalls act as a barrier between trusted internal networks and untrusted external networks, such as the internet. By monitoring and filtering traffic based on security rules, firewalls help prevent unauthorized access to or from a private network, thus enhancing overall security.

This role is critical in protecting sensitive data and systems from potential threats and attacks. The firewall can be configured to allow or block specific types of traffic based on various criteria, including IP addresses, domain names, protocols, and port numbers. By managing traffic effectively, firewalls help ensure that only legitimate and safe data can enter or leave the network, which is essential for maintaining the integrity of the network security posture.