D2 and D4 ;What is it for ?
https://blogs.technet.microsoft.com/janelewis/2006/09/18/d2-and-d4-what-is-it-for/
How Domain and Forest Trusts Work
https://technet.microsoft.com/pt-pt/library/cc773178(v=ws.10).aspx
Interview Questions
https://wintelinterviewquestions.blogspot.com/
http://microsoftworld.blogspot.com/2011/07/questions-on-clustering.html
Yogesh 