Reason I ask is that I have noticed that I had some trouble logging onto our exchange server when power cycling the main (1st installed or GCS) domain controller. I thought that installing a second domain controller was supposed to handle requests for svc's whe nthe main one went down for any reason. Does it have anything to do whether the second BDC is listed under DNS on the member servers' network card?
Secondly, lets say I want to upgrade from w2k domain to w2k3 domain. What is the procedure for this? Can I just add w2k3 member servers first and then upgrade them to dc's... and then what..?
Last, what are the roles that a 2nd domain controller plays when added to the domain? What roles does the main server or 1st domain controller. I know it is a global catalog server. Is this a role that you somehow "transfer" to a member server when changing roles from an old DC to a new one?