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We have many videos focused on the ICND1 and ICND2 exams. For example, we have a video which explains the importance and history of the OSI Model, which is how computers communicate. Although the OSI Model is not commonly used today, the OSI Model is the best way to explain how computers communicate. The OSI Model contains many layers that are used for communication. They include the Physical Layer, Data Link Layer, Network Layer, Transport Layer, Session Layer, Presentation Layer and Application Layer. This video explains what they do and when they preform their functions.