Upon conducting a routine network audit, a network administrator discovers an unexpected wireless signal with a network name mimicking the naming convention used within the organization. The device appears not to have been set up by any members of the IT team, suggesting it could be unauthorized equipment. What should be the administrator's IMMEDIATE course of action to address this potential security threat?
Initiate an immediate network-wide scan for potential malware or other security breaches.
Proceed with the firmware updates for all legitimate networking equipment to strengthen security protocols.
Identify and disconnect the unauthorized device from the network.
Implement static IP allocation for all sanctioned devices to prevent them from connecting to the unauthorized device.
Enhance the authorized access points' broadcasting power to dominate over any unsanctioned signals.
Adjust the network name used by the organization's official wireless access to preclude confusion.