So I've been reading for some time about this model. And I couldn't find an answer for the following question: I know that one of layer 6s jobs is to decide on a format for the data that it received from layer 7. For example .jpg. How does it know what format to add? Thanks !
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You know that the presentation layer is almost never used in practice, right? – Yu Hao Dec 10 '14 at 12:47
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Yep, i still need to study it though.. – Alex_t Dec 10 '14 at 12:56
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You know that in the real world there is no such thing as a presentation layer? That this is just an abstract concept in an abstract model that corresponds to nothing in the real world? Tell your teacher. – user207421 Mar 10 '17 at 08:54
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ISO's OSI Model is a reference model for communication (theoretical). According to it's guideleines, the TCP/IP protocol suite is developed (practical). Also, Presentation and Session layers are eliminated from actual TCP/IP protocol suite implementation. That being said, the answer to your question is, that one of the application layer protocol just passes the *.jpg file to transport layer as pure binary "data".
Narendra Petkar
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So you are saying that the content data is "transparent" to the presentation layer ? – Alex_t Dec 10 '14 at 17:25