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my name is Alexander. I have problems with English, but I hope you will understand me anyway.

I'm preparing for CCNA 200-301 and I have some problems with OSI model. Let me give you a little context. First of all let's define what is TCP/IP model. TCP/IP model is a set of documents (protocols) that logically separate from each other (layers). Using that model we can built a real network. So it is a "real" model that we use every day. But what with OSI model? Different internet resources says different things. Some of them says this is also set of documents (protocols) as TCP/IP. Other says OSI model is just a conseptual model and nothing more (it does not refer to any particular document (protocol)). I don't know what to think. I'm confused.

Please using decription of my problem give me strict defenition what is OSI model and what's the difference between OSI and TCP/IP models.

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