What security measure do firewalls implement in network infrastructure?

Firewalls play a crucial role in network security by monitoring and controlling network traffic based on predefined security rules. This process involves inspecting incoming and outgoing data packets and determining whether they should be allowed through or blocked based on established security policies. These policies can include criteria such as IP addresses, ports, protocols, and specific applications, allowing organizations to create a tailored protective barrier around their network infrastructure.

By implementing these rules, firewalls help protect the network from unauthorized access and various cyber threats, ensuring that only legitimate traffic is permitted. Additionally, they can log and report traffic data, aiding in the identification of potential attacks or security violations. This proactive approach to managing data flow is essential for maintaining the overall security posture of an organization.