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So, in case of problems with logging in with a new password, clock out of sync, password changing or account lockout, check the PDC. Global Catalog: Stores a replica of all the objects in it’s domain and a partial replica of objects in other domains in the forest.There’s one more role tha’s not part of the five above, but interacts with some of them, any domain controller can have it. The schema determines the types of objects permitted in the forest and the attributes of those objects.ĭomain Naming Master: Handles domains in the forest. As this rarely happens, it usually doesn’t see much use.
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If you give access to this domain to a user from another domain, the infrastructure master comes into play. Infrastructure Master: Deals with mapping objects cross-domains. If the pools get depleted and this server is unavailable no new objects can be created. Relative IDentifier Master: Basically assigns pools of IDs (think MACs) to other domain controllers that they use to create new objects (user accounts, groups, etc.). Also acts as legacy PDC for older NT servers. All other computers syncronize their clocks with the PDC, so this one should sync with and external time source. If a login fails on some other domain controller it gets forwarded to this computer before rejecting.
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PDC Emulator: Where account information is most up-to-date. There are five of them, three domain-wide roles and two forest-wide: Domain roles These are ways to check who currently holds different FSMO roles and transfer them from one server to another, taken from various KB articles, condensed here for future reference, as well as a short explanation of what those roles are. Each role can be held by only one server. View and transfer FSMO roles in Active DirtectoryįSMO roles are tasks that domain controllers have to do in an Active Directory environment, they control the proper operation of the network.