7 :
- ;
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- .
(Physical Layer) , , , , , , , .
(Data Link Layer) . , , , , , .
(Network Layer) , . ( ) ( ).
(Transport Layer) () . , ( ), , ( ).
(Session Layer) , , .
(Presentation Layer) , , . , /, .
(Application Level) OSI , . , , . , : , .
, () .
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, .
, , , .
, , . . , . .