It just shows from your first mail that you need to increase your basic understanding about network infrastructure before anything else.
You just need to know something about AD's GPO's and DC's to get things work and that knowledge you need to get from studying, there is no shortcuts.
It's actually pretty annoying that people are actually working in IT industry without suitable level of education. Meanwhile i have spent years with studying and i have no job.
Even more annoying is that fact that there are plenty of people who got into business years ago, and have plenty of working experience and they despise others who have only education and certificates.
Technology has improved vastly in last years and if you think a guy who has worked let's say 10 on more years, my bet is that he knows very little about current systems because it takes too much effort to study while you are working at the same time.
Anyhow this guys think they are real guru's because they have work 'experience'.
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Of course there IS those real guru's out there too, who have got flexible employers which let those dudes study more while they are getting paid whole time.. companys even pay their courses. :D
Lucky bastards!