In terms of network security, what is a primary role of a firewall?

The primary role of a firewall in network security is to filter data packets. This process involves examining incoming and outgoing network traffic based on predetermined security rules. Firewalls serve as barriers between a trusted internal network and untrusted external networks, helping to block unauthorized access while allowing legitimate traffic through. By filtering packets, a firewall can prevent malicious data from entering the network, protect sensitive information, and enforce various security policies.

In the context of network security, enhancing signal strength is not relevant to the firewall's function; that is more related to hardware and signal transmission. Cabling connectivity pertains to the physical connections within a network rather than the logical control of data traffic. Routing traffic deals with directing data packets across the network rather than specifically determining which packets should be allowed or blocked based on security criteria. Therefore, filtering data packets is essential for maintaining a secure network environment.