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how the LEN of the eth frame is determined?


In the Ethernet Encapsulation, (RFC#894), we have

* destn. h/w addr (6 Bytes)
* src h/w addr (6 Bytes)
* frame type (2 Byte)
* data (min 46 to max. 1500 Bytes)
* CRC (4 Bytes)

Where is the length of the frame?  If I have only 50 bytes of data, how the
receiving ethernet will know that the data size is only 50 bytes?

-- mks --