What does a firewall primarily do in a network?

A firewall primarily serves as a security device in a network, functioning to monitor and control the incoming and outgoing traffic based on predetermined security rules. This is crucial in protecting the network from unauthorized access, cyber threats, and unwanted traffic. By establishing a barrier between a trusted internal network and untrusted external networks, a firewall can prevent malicious users and attacks from compromising sensitive data.

The role of a firewall is pivotal in maintaining the integrity of data and ensuring that only legitimate traffic is allowed to enter or leave the network. This ensures that both the security of the network and the devices connected to it are upheld, thereby creating a safer computing environment.

In contrast to increasing internet speed, recovering lost data, or assigning IP addresses, the primary function of a firewall does not relate to enhancing speed or conducting data recovery and IP address management tasks. Instead, its main aim is to enhance network security through its traffic monitoring and control capabilities.