2-44 Figure 2-14: Ethernet Frame Preamble (7 octets) 10101010 … Start of Frame Delimiter (1 octet) 10101011 Destination Ethernet (MAC) Address (48 bits) Source Ethernet (MAC) Address (48 bits) Length (2 octets) Length of Data Field Header The Ethernet frame has 48-bit destination and source address fields.
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