Your network contains an Active Directory forest. The forest contains a single domain named
contoso.com. The domain contains four domain controllers. The domain controllers are
configured as shown in the following table.
All domain controllers are DNS servers.
You plan to deploy a new domain controller named DC5 in the contoso.com domain.
You need to identify which domain controller must be online to ensure that DC5 can be
promoted successfully to a domain controller.
Which domain controller should you identify?

A.
DC1
B.
DC2
C.
DC3
D.
DC4
Answer is A. DC1
Domain naming master:
The domain naming master domain controller controls the addition or removal of domains in the forest
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3
The question states adding a new domain controller not a new domain. To add new object (as in joint DC5 to domain) RID must be present.
So D. DC4 is correct.
4
0
Jojo is right
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6
No, Jojo is not right. You need the RID Master to be online.
6
0
Question is to “add” a DC, not a domain. So I say D is correct.
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You need RID master to be able to assign the identifiers.
http://support.microsoft.com/kb/223346
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I agree with JOJO, A is the answer
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7
RID
Allocates active and standby RID pools to replica domain controllers in the same domain.
Must be online for newly promoted domain controllers to obtain a local RID pool that is required to advertise or when existing domain controllers have to update their current or standby RID pool allocation.
Correct answer is D.
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0
RID is the correct answer like KiD and Monu stated.
2
0
A is correct
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1
D is correct.
https://support.microsoft.com/en-us/kb/223346
RID server (or role, whatever):
Must be online for newly promoted domain controllers to obtain a local RID pool that is required to advertise or when existing domain controllers have to update their current or standby RID pool allocation.
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The RID master is responsible for processing pool requests from all DCs in a particular domain. so D-DC4 is the correct answer.
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Choice d: DC4 – RID Master is the correct answer.
According to Microsoft: RID
•Allocates active and standby RID pools to replica domain controllers in the same domain.
•Must be online for newly promoted domain controllers to obtain a local RID pool that is required to advertise or when existing domain controllers have to update their current or standby RID pool allocation.
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D) is correct, A is not. You’re not creating a new domain. Read the questions.
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0
Correct answer is B and D
PDC and RID
gotten from:Exam Ref 70-417:upgrading your skills to mcsa windows server 2012
page 91:
“EXAM TIP
Make sure the PDC Emulator and RID Master are online and available whenever you add a new domain controller to an existing domain”
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Exam Ref 70-417 R2 is page 108 and the exam tip is , make sure rid master is online and available when adding new DC to domain.
If its first DC in new domain existing forest then domain naming master must be available.
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Domain Naming Master is explicitly designated as being required
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