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How to identify a MAC  whether it is unicast MAC or broadcast MAC or Multi cast MAC by just looking the octet value?

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To find whether the given address is unicast or multicast just check the least significant bit of first byte. If it is 0 then the given address is unicast address ,if it is 1 then given address is multicast address

Note : if all bits are 1 then it is broadcast address

Broadcast address is the proper subset of multicast address

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