How does the Aruba Security Feature "Network Access Control" function?

Network Access Control (NAC) is a security feature that plays a critical role in managing how devices connect to a network. This feature enhances security by ensuring that only compliant and authenticated devices are granted access. The primary function of NAC involves assessing the security posture of devices before they can join the network. It evaluates various factors such as device health, operating system, antivirus status, and user authentication credentials.

When a device attempts to connect, NAC conducts these checks and restricts access to those that do not meet the established criteria. This means that only devices that adhere to the organization's security policies can access network resources, effectively safeguarding the network from potential threats posed by non-compliant or unauthorized devices.

In contrast, the other options do not accurately represent the core functionality of Network Access Control. Allowing unrestricted access undermines security. Monitoring device traffic is part of broader network management but does not define NAC. Disabling non-registered devices might be a potential action but is not the comprehensive function that NAC provides regarding access based on compliance and authentication. Thus, the emphasis on restricting access based on device compliance and user authentication clearly defines the essence of NAC in network security.