![]() In Layer-2 (Ethernet) Multicast address, LSB (least significant bit) or first 3 bytes of the first octet of an address is set to one and reserved for the multicast addresses. Multicast addresses enables the source device to transmit a data frame to multiple devices or NICs. If the LSB (least significant bit) of the first octet of an address is set to zero, the frame is meant to reach only one destination NIC. A Unicast MAC address frame is only sent out to the interface which is assigned to a specific NIC and hence transmitted to the single destination device. The Unicast MAC address represents the specific NIC on the network. There are three types of MAC addresses, which are: The MAC address can be represented in below three formats:.Vendors or manufacturers can use any sequence of digits to the NIC specific digits, but the prefix should be the same as provided by the IEEE. The last three octets are NIC specific and used by the manufacturer to each NIC card.Some example of OUI of known vendors are:. ![]() These MAC prefixes are assigned to each organization or vendor by the IEEE Registration Authority Committee.
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