What is the primary role of a network firewall?

The primary role of a network firewall is to monitor and control network traffic based on security protocols. A firewall acts as a barrier between trusted internal networks and untrusted external networks, such as the internet. It inspects incoming and outgoing traffic and enforces predetermined security rules to either allow or block specific traffic, thus protecting the network from unauthorized access and potential threats.

By monitoring the data packets that travel through a network, the firewall can identify potentially harmful traffic and prevent it from entering the network, while allowing safe traffic to pass. This function is crucial for safeguarding sensitive information and maintaining the integrity of the network.

While options like boosting transmission speed, providing wireless access, or integrating networks deal with operational or connectivity aspects of networking, they do not encompass the security focus that is central to the function of a firewall. Therefore, the correct answer highlights the essential security role that firewalls serve in network management and protection.