What is the primary function of a firewall?

The primary function of a firewall is to control incoming and outgoing network traffic. Firewalls serve as a barrier between a trusted internal network and untrusted external networks, such as the internet. They inspect data packets and apply a set of predefined rules to determine whether to allow or block specific traffic based on security policies.

By managing this traffic, firewalls help protect systems from unauthorized access, cyber threats, and potential data breaches. They can be configured to prevent certain types of traffic, allow access to specific services, and monitor network activity for suspicious behaviors. This control is crucial in maintaining the security and integrity of an organization's internal network.

Other options do not accurately capture the primary role of a firewall. Enhancing internet speed, acting as a data backup solution, or providing internet access to multiple users do not align with the fundamental purpose of a firewall in maintaining network security.