802.3 frame headers

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The MAC header for the 802.3 adapter is composed of two fields, as shown in this MAC header table.

Table 1. 802.3 MAC header
Field Length Definition
DA 6 bytes Destination address.
SA 6 bytes Source address. If bit 0 of this field is set to 1, it indicates that routing information (RI) is present.

The LLC header for 802.3 is the same as for Token-Ring MAC header.