Why is the OSI model useful when it does not model network communication exactly?
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Even though it does not equate precisely to the current implementation of network technologies, the OSI model allows for a granular look at the different levels of transmission to provide more thorough analysis of how transmissions are organized from raw signal to packets, frames, sessions, and extracted messages.Even though technologies such as NIC cross different layers, OSI still allows you to easily identify the characteristics of the technology and the level to which it applies (such as the data link layer addressing and physical layer specification for media).
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