A Media Access Control (MAC) address is a number that uniquely identifies a device on a network and is usually made up of ______ bits.

A MAC address is a hardware identifier that is 48 bits long, written as twelve hexadecimal digits.

It is burned into the network interface card by the manufacturer and stays fixed for the device.

16 bits is far too small and matches values like a port number, not a hardware address.

32 bits is the length of an IPv4 address, which is logical and changeable, not a physical MAC.

128 bits is the length of an IPv6 address, again a logical network address.

The first 24 bits form the OUI identifying the maker and the last 24 bits identify the card.