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AD Sites, Replication & Forest Trusts Flashcards

6 cards from real MCTS 70-640 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the tombstone lifetime in Active Directory and why does it matter for replication?

    Answer: The time a deleted object remains as a tombstone before being permanently purged; DCs offline longer than this period cannot replicate back safely

    The tombstone lifetime (default 60 or 180 days) defines how long deleted objects persist; a DC offline longer than this can cause lingering objects and replication inconsistencies.

  2. What is a Universal Group Membership Caching (UGMC) and when would you enable it?

    Answer: Caching of universal group memberships on a DC in a site without a global catalog server, to avoid WAN lookups at logon

    UGMC lets a DC in a remote site cache universal group memberships locally so logon doesn't require a WAN round-trip to a global catalog server.

  3. What is the global catalog (GC) in Active Directory?

    Answer: A DC that stores a full writable copy of all objects in the forest with a partial read-only copy of all other domains

    The global catalog is a special DC role that holds a complete copy of all objects in its own domain and a partial (read-only) copy of objects from all other domains in the forest.

  4. Which FSMO role is responsible for maintaining a consistent time source across all domain controllers in a domain?

    Answer: PDC Emulator

    The PDC Emulator is the authoritative time source for its domain; all other DCs in the domain sync their clocks to the PDC Emulator to keep Kerberos working.

  5. What does the Infrastructure Master FSMO role do?

    Answer: Updates cross-domain object references (phantom objects) when objects in other domains are renamed or moved

    The Infrastructure Master updates phantom object references so that group memberships and other cross-domain links reflect changes made in other domains.

  6. Which tool in Windows Server 2008 allows administrators to manually create connection objects and override the automatic replication topology?

    Answer: Active Directory Sites and Services

    Active Directory Sites and Services (dssite.msc) is used to manage sites, subnets, site links, and manually create or delete connection objects between DCs.