A small business owner wants to prevent employees from disconnecting company computers from the network jacks and connecting their personal computers. Which of the following must a technician…

MAC filtering works at Layer 2 by allowing the network switch or router to maintain a whitelist of approved hardware (MAC) addresses. When a device connects to a network jack, the switch checks its MAC address against the approved list and denies access if the address is not recognized. This ensures only company-authorized computers, whose MACs are registered, can obtain network access.

Disabling unused ports prevents any connection to those ports entirely, but it does not selectively allow company computers on active ports while blocking personal ones.

Static IP addresses control address assignment but do not authenticate or restrict which physical devices are permitted to connect to the network.

Cable locks are a physical anti-theft measure that prevent a computer from being physically removed, but they do not control network access for unauthorized devices.