CompTIA Network+ Practice Test

Network Access Control (NAC) primarily focuses on ensuring that only authenticated and authorized devices can access network resources. By requiring authentication on each interface for communication, NAC helps to create a secure environment, allowing administrators to enforce policies based on the identity of the users and devices trying to connect. This means that devices must prove their legitimacy before being granted access to the network, providing an essential layer of security against unauthorized access.

The other options do not align with the objectives of NAC. Unrestricted access for all devices contradicts the very purpose of NAC, which is to control and restrict access based on authentication. The requirement for all network devices to have the same configurations is not a necessity for NAC, as different devices can have varying configurations while still adhering to NAC policies. Similarly, consistent firmware across networks is not a NAC requirement; while having updated firmware is generally good practice, NAC focuses more on access control mechanisms rather than ensuring uniformity across devices.