What does a firewall do for a network?

A firewall serves a critical role in network security by filtering incoming and outgoing traffic. This means that it monitors and controls the data packets sent to and from a network based on predetermined security rules. By establishing these rules, a firewall can effectively prevent unauthorized access and ensure that only legitimate traffic is allowed through. This function is essential for protecting sensitive information and maintaining the integrity of the network, making the firewall a foundational component of cybersecurity strategies.

In contrast, boosting wireless signals, increasing data download speed, and storing backup data do not relate to the core functions of a firewall. These actions pertain to different aspects of network management and infrastructure but do not encompass the primary goal of a firewall, which is to safeguard network resources by managing traffic flow.