Flexible Single Master Operations
(FSMO)
u Certain operations require a master role holder
u FSMO roles:
l One master role holder per forest
l Schema Master - Schema Management
l Domain Naming Master - Domain Tree Management
l One master role holder per Domain
l PDC Emulator – PDC for Windows NT 4.0 BDCs,
Password conflicts, Domain Master Browser
l Infrastructure FSMO –  Maintains changes for   cross-
domain object references
l Rid Master - RID Pool Allocation
u First DC in forest will maintain all five FSMO roles
u Ntdsutil can be used to transfer or seize a role