MAC-media access control address
Inside every NIC, burned onto some type of ROM chip, is special firmware containing a unique identifier with a 48-bit value called the media access control address, or MAC address.Meyers, Michael (2012-01-09). CompTIA Network+ Certification All-in-One Exam Guide, 5th Edition (Exam N10-005) (Page 20). McGraw-Hill Osborne Media. Kindle Edition.