The first question i can see as relavent to a domain admin but is something you really need to know? You do need to know the roles if you replace the global catalog server on a 2k network and probably 2k3 which is typically something you prepare for in advanced so you would have looked up all that information before the switchout.

The questions remind me of an interview I went on a couple years ago and could tell them what all the tech abbreviations stood for. I simply replied back with the function of each abbreviated item was and told them that is all I need to know. Knowing what they stand is not going to fix the problem any faster then knowing what the actual function is.