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We begin this chapter with an in depth discussion on the OSI Reference Model, in terms of what it is, what it means, and how it helps us in networking. We define various acronyms, provide clarity on how the standards we follow were established and by whom and what those relationships are to the practices and required learning we must master as IT professionals. You'll also learn the function of each layer, how data is transmitted, what packets are, and how this ties into and controls what happens as part of network security.