Protect Your Windows Network: From Perimeter to Data by Jesper M. Johansson, Steve Riley
In my opinion, this is
THE best book I have ever read (and I have read a few) on security in a Windows network. It is very well written; unlike a standard security book that simply has configuration guides and checklists. These guys are not only security gurus, they are very good authors who know how to write. The book has a definite Microsoft bias, but I found very little that I would disagree with. I highly recommend this book, and no I am not getting any kick backs for marketing this book.

I think that it would be helpful to those persuing the "Security" specialization for MSCA/E, even though it does not directly map to the exam itself.
http://www.amazon.com/Protect-Your-Windows-Network-Addison-Wesley/dp/0321336437/sr=1-5/qid=1164214465/ref=sr_1_5/103-6893049-6293469?ie=UTF8&s=books