Which of the following is a feature of NAC in network security?

Network Access Control (NAC) is designed to enforce security policies for devices attempting to connect to a network. One of its primary features is the ability to highlight and profile devices based on their access rights. This involves identifying devices as they connect and determining what level of access they should have based on predefined security policies.

By profiling devices, NAC helps in maintaining a clear understanding of what types of devices are on the network, including their compliance with security policies. This allows organizations to manage access intelligently, ensuring that only devices that meet certain security criteria are allowed access to sensitive parts of the network, thereby enhancing overall network security and reducing vulnerabilities.

The other options do not accurately represent the core function of NAC. While ensuring devices are updated and monitoring internet speed are important for network management, they do not reflect the primary role of NAC in access control and policy enforcement. Providing free access is contrary to the principles of NAC, as its purpose is to safeguard the network by regulating access rather than allowing unrestricted connectivity.