What is the first 24 bits in a MAC address called?
A. NIC B. BIA C. OUI D. VAI
Correct Answer: C. OUI
Explanation: An Organizationally Unique Identifier (OUI) is a 24-bit number that uniquely identifies a vendor, manufacturer, or other organization globally or worldwide. They are used as the first 24 nits of the MAC address to uniquely identify a particular piece of equipment.