A remote worker is visiting a branch office to attend face-to-face meetings.

TheCCST Cybersecuritymaterial explains that MAC address filtering is a wireless security measure that allows only devices with approved hardware addresses to connect. If the laptop’s MAC address is not on the allow list, the connection will be blocked even if the SSID is correct.

"Wireless access points can be configured with MAC address filters to limit network access to authorized devices. If a device's MAC address is not on the permitted list, the connection will fail regardless of credentials."

(CCST Cybersecurity,Basic Network Security Concepts, Wireless Security section, Cisco Networking Academy)

Ais unlikely because non-broadcast SSIDs can still be manually connected to.

Bis correct: MAC address filtering would block an unregistered device.

Cwould cause IP issues after association, not prevent initial connection.

D(open authentication) would allow connection, so it’s not the cause here.