What is the primary purpose of Network Access Control (NAC)?

The primary purpose of Network Access Control (NAC) is to enhance the security of a network by enforcing policies that determine which devices are allowed to connect and what level of access they have. NAC systems assess the security posture of devices attempting to access the network, ensuring they comply with predefined security policies. This includes checking for updated antivirus software, operating system patches, and other security configurations. By controlling access based on these assessments, NAC helps to prevent unauthorized access and mitigate potential threats, thereby protecting sensitive data and maintaining the integrity of the network.

The final answer is: Network Access Control (NAC) primarily serves to enhance network security by enforcing access policies and assessing the security posture of devices.