Mac filtering is a type of port-security on a switch. It allows a switch to only permit a certain amount of mac addresses, or only an exact set of mac addresses on a specific port. This is usefull if a network jack is in a public area.
In computer networking, Media Access Control MAC Filtering' (or EUI filtering, or layer 2 address filtering) refers to a security access control method whereby the 48-bit address assigned to each network card is used to determine access to the network.
MAC addresses are uniquely assigned to each card, so using MAC filtering on a network permits and denies network access to specific devices through the use of blacklists and whitelists. While the restriction of network access …