Type your answer here... Answer Explanation: Network Access Control (NAC) is a concept that uses policies to enforce controls that dictate object access within a network. NAC applications can be configured to test a system in order to verify that it adheres to company policies, such as confirming that system patch levels and antivirus software are up to date. If the system does not adhere to the policies configured, it can prevent the system from accessing the network, or it can provide limited access until the system complies with the policies.