The MAC address is the layer 2 address that helps each computer identifies itself in a network. This address is built by the manufacturer and is installed in a microcircuit of the NIC. Each address is unique. The given address consists of 48 bits and is expressed in hexadecimal. IEEE (Institute of Electrical and Electronic Engineers) allocates the first 3 bytes for the manufacturer; then the manufacturer specifies the last three. This system ensures that a MAC address is unique. MAC addresses have one major disadvantage; they are unstructured and are considered flat address spaces182
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