If the bit is set to 1 then it is a Group address and is a multicast/broadcast address. If the bit is set to 0 then it is an Individual MAC address and is a unicast address. The Individual/Group address bit is used to signify if the destination MAC address is a unicast or a multicast/broadcast Layer 2 address. The least significant bit of the first octet of the MAC address is the Individual/Group(I/G) address bit and the next to least significant bit of the first octet of the MAC address is the Universally or Locally(U/L) administered address bit. There are two bits in the first octet of a MAC address that are used to define certain aspects of the MAC address. ![]() ![]() This post is going to be about a topic I have breezed over in the past when reading about MAC addresses but decided to do a little more research on.
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