What is the purpose of network access control (NAC)?

The purpose of network access control (NAC) is to enforce security policies on devices that are attempting to access the network. NAC solutions assess the security posture of devices before they connect, ensuring that only compliant devices can access network resources. This assessment includes checking for up-to-date antivirus software, necessary updates, and other security configurations. By enforcing these policies, NAC helps to prevent unauthorized access and protect sensitive information within the network.

This approach is crucial because it helps organizations manage risk and maintain a secure network environment, ensuring that devices conform to their security standards prior to gaining full access. This proactive method of regulating access is fundamental to safeguarding the overall integrity and security of the network.

The other options focus on aspects that are either not directly related to NAC or do not encapsulate its primary function. For instance, controlling physical access to hardware is more aligned with physical security measures rather than network access control. Enhancing the speed of network connections does not relate to the security-focused goals of NAC, and performing regular security audits is a different process that is concerned with assessing and improving network security without the direct enforcement of access policies.