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You keep using that word. I do not think it means what you think it means.
–William Goldman, The Princess Bride
Almost every profession has its own specialized vocabulary; doctors, priests, pilots, lawyers, and plumbers all use specific words to mean specific things. That’s because their professions all require precise descriptions of various phenomena, processes, and objects. Guess what? Computer security professionals have a specialized vocabulary, too. To absorb the material in this book and apply it to effectively secure your Microsoft Exchange infrastructure, you’ll need to understand some vocabulary that’s foreign to many messaging administrators.
This chapter describes some basic security concepts, giving examples of them and describing where they fit in the overall scheme of security design. These concepts form the foundation that you’ll use to design and deploy security configurations that meet your overall messaging security needs.
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