Figure 114 MAC Addresses Data Link Addresses and the IEEE Sublayers of the Data Link Layer Are All Related

LLC sublayer

sublayer

MAC addresses

Data-link addresses

MAC addresses art 48 bits in length and art expressed as 12 hexadecimal digits. The first 6 hexadecimal digits, which art administered by the IEEE, identify the manufacturer or vendor and thus comprise the Organizationally Unique Identifier (OUI). The last 6 hexadecimal digits comprise the interface serial number, or another value administered by the specific vendor. MAC addrtsats somttimts are called aumed-ie addresses (BIAs) because t hey art burned into readonly memory (ROM) and art copied into random-access memory (RAM) when the interface card initializes.Figure 1-15 flu strates che MlAC address fonnlat.

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