First let me say, I am a programmer(not a super star) but I want to get more into the system/network administration side of things. This because there are more jobs for system/network administrators in the area I live.

Right now I am using virtual machines to learn how windows 2008/2012 works and to build labs with. But how would I prove to an employer what my skill set is with windows 2008/2012? As a programmer I would point to my past projects, code samples, and so on.

Thanks for any help.