Frame Operations.

The article comments on the composition of different types of Ethernet Frames. In reality, there is only one physical Ethernet frame. Each Ethernet NIC contains a unique address burned into its read-only memory at the time of manufacture. To ensure that this universally administered address is not duplicated, the IEEE assigns blocks of addresses to each manufacturer. These addresses normally include a three-byte prefix, which identifies the manufacturer and is assigned by the IEEE, and a three-byte suffix, which is assigned by the adapter manufacturer to its NIC.