ETHERNET FIELDS:

 In Ethernet fields the preamble and CRC is usually not given in frame. The destination address of each is the broadcast address. There is special value reserved for frame kind field.

FRAME WITHOUT TYPE FIELDS:

Some LAN methods do not add a kind field. Receiver and sender can agree on interpretation, which is as given: They agree on single message format and need only that formats these limits to one kind of data. In this way all devices on LAN have to use one format. Also they agree to encode the message format into first few bytes of the data field.