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Infrastructure Masters FSMO role

By Shanghai Sam ·
I need an explanation of exactly what the Infrastructure Master does and how it does it. MS porvides no clear explanation of EXACTLY when you need the IM or HOW is works. Lets say you have Domains A.com, B.A.COM and you want to add another domain. Currently all DCs in both domain A and B domains have Global Catalogs and that’s fine (Q223346). Now you add domain C.B.A.COM but domain C will have one DC that will have no FSMO roles on it. Question: Where and how many IMs are absolutely necessary in this forest following the Q223346 recommendations and combinations I list at the end of this question? Also IMs function detail ie aks, naks, push/pull, time between replication.

Points will be awarded to the answer that provides reference to Q article/s, published book&author or reputable web site.

I have done research and compiled the following documented FSMO combinations that work and don't work: OIL AND WATER

[Separate]
Global Catalog vs Active Directory-integrated DNS
Q252695 Event I 4011

[Together]
RID and PDC emulator roles on the same DC.
Separate if load justifies.
Q223346

[Separate]
Infrastructure Master vs Global Catalog
Q223346

[Together]
Schema Master and Domain Naming master
Roles should be placed on the same domain controller as they are rarely used and should be tightly controlled.
Q216899

[Together]
Domain Naming Master and Global Catalog Server.
Q216899

[Separate IF]
The Infrastructure Master should not be located on the same domain controller holding the RID master and PDC emulator roles if it is also a GC server
Q216899

Combination break down from above:
SM/DNM & DNM/GC = SM/DNM/GC
[Q223346]

PDC/RID/IM or PDC/RID/GC but not PDC/RID/IM/GC
[Q216899] & [Q223346]

not GC/AD-DNS if Event ID 4011
[Q252695]

not GC/IM
[Q223346]

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