(data link layer) , (frame). , . , , (, ). , , , .
, . , :
■ (start of frame, SOF);
■ , ( );
■ , ( );
■ ( );
■ ;
■ ( );
■ () (end of frame, EOF).
, . , , (, ), . , .
, , . .
(cyclic redundancy check, CRC). , (SOF, , , , EOF). . , , . . , .
: (logical link control, LLC) (media access control, MAC).
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LLC . MAC ( ) MAC-, . , MAC , , , . . , MAC .
, . (, 0004AC8428DE). , , , . , , , . (, ) , , . , , .
, . , , . , , .
. , , . , .
LLC , . ( 1) (connectionless service), . ( , ), .
( 2) (connection-oriented service), . , , , , . ( , ). . .