The Impossibility of Knowing it "All"
I agree with many of the above comments. But, even within one's specialty, it's impossible to know the answer to every variable or every question. IT has become so specialized, that it's comparable to the auto repair industry wherein there are different areas of expertise: the paint and body man, the transmission mechanic, and so on. In my position as desktop support, I am continually asked how to perform tasks in software. How do I do this task in AutoCAD, for instance is a common one. My answer is always a humorous "If I knew how to do that, I'd be an engineer, and not in IT". My point is, sometimes its just not our job to know the answer.
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