MAC filtering, or Media Access Control filtering, is a network security feature that allows network administrators to restrict access to a network based on the MAC addresses of devices attempting to connect. A MAC address is a unique identifier assigned to every network interface card (NIC) and is used to identify devices on a network.
MAC filtering can be an effective way to improve network security by preventing unauthorized devices from accessing the network. It is often used in conjunction with other security measures, such as firewalls and intrusion detection systems, to provide a comprehensive security solution.