Answer : 48 bits
In a LAN, each node is assigned a physical address,
also known as a MAC/Ethernet address. This address is unique to each of the
nodes on the LAN and is 6 bytes (48 bits) long, which is burned on
the Ethernet card (also known as the network interface card).
The Ethernet address is 48 bits long and normally
displayed as 12 hexadecimal digits.
The MAC address stands for Media Access Control Address.
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