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Unicast packets are delivered to a specific recipient on an Ethernet or IEEE 802.3 subnet by setting a specific layer 2 MAC address on the Ethernet packet address. Broadcast packets make use of a broadcast MAC address (FF:FF:FF:FF:FF:FF), which includes setting the broadcast/multicast bit in the address.
Originally posted by staple
In Ethernet networks, a frame that has a hexadecimal MAC address of FF-FF-FF-FF-FF-FF. This hexadecimal address is equivalent to 48 binary “ones.” The meaning of this address in Ethernet is simply that this frame is intended to be received and processed by every node on the network of computers. Broadcast frames are generated when certain network services need to make announcements to other hosts on the network. Too many broadcast frames on a network can degrade communication between nodes on the network.