What is the core function of a firewall within network security?

The core function of a firewall within network security is to block unwanted network traffic. Firewalls act as a barrier or filter between a trusted internal network and untrusted external sources, such as the internet. They analyze incoming and outgoing traffic based on predefined security rules and policies, allowing only authorized communication to pass through while blocking potentially harmful activities.

Firewalls can operate at various levels, such as network-level or application-level, and can be configured to protect against specific threats, including unauthorized access attempts, malware, and network intrusions. This traffic management is crucial for maintaining the security and integrity of a network, as it helps prevent attacks and ensures that only legitimate users and data can enter or exit the network.

Understanding this primary function is key to implementing effective network security measures that safeguard sensitive information and maintain the overall health of the network infrastructure.