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preamble and SFD use as physical layer header 

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The first field(Preamble) of 802.3 frame contains 7 bytes of alternating 0s and 1s that alerts the receiving system to the coming frame and enables it to synchronize its input timing. Preamble is added at the physical layer and is not part of the frame.

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Preamble. It only serves as a header at physical layer but not actually a part of frame and is used for synchronization of input.
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