Forest Root Domain ( Parent Domain ) and Child Doamin FSMO Role location same server ?

I'm reviewing a large domain that is set with Forest Root Domain say abcus.com and a child domain 123.abcus.com .  Has a funky setup is mixed mode and noticing  that the FSMO roles are placed on same servers  for Schema and Domain Naming Master and was wondering why ? My Goal is to place FSMO's  for abcus.com all on one DC with enough resources and  123.abcus.com  FSMOs on one 123.abcus.com DC.

abcus.com FSMO


netdom query fsmo
Schema master               DC02.abcus.com
Domain naming master DC02.abcus.com

PDC                                   DC02.abcus.com
RID pool manager          DC003.abcus.com
Infrastructure master   DC02.abcus.com


123.abcus.com FSMO


netdom query fsmo
Schema master                      DC02.abcus.com
Domain naming master        DC02.abcus.com

PDC                                     DC005.123.abcus.com
RID pool manager            DC005.123.abcus.com
Infrastructure master       DC004.123.abcus.com
newbie2239Asked:
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Will SzymkowskiSenior Solution ArchitectCommented:
Has a funky setup is mixed mode and noticing  that the FSMO roles are placed on same servers  for Schema and Domain Naming Master and was wondering why ?

This is by design. Schema and Domain Naming Master Roles are FOREST SPECIFIC, so these roles will reside on a domain controller in the Forest Root Domain.

Domain roles are below...
Rid Master
Infrastructure Master
PDC Emulator

So to answer your question the setup is correct. You cannot have Forest Roles in a Child domain. Only the domain roles will be present in the Child domain which i have illustrated above.


Will.
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newbie2239Author Commented:
What is your view on leveraging AD DNS from the parent domain vs  adding DNS when dcpromoing in a new Domaincontroller ?
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Will SzymkowskiSenior Solution ArchitectCommented:
You should have DNS installed on all DC's in your environment. A DC is pretty useless without DNS as it relies on DNS to function. So if you have a DC that. Does not have DNS it has to rely on other DC that do have it.

DNS also provides redundancy as well when it is installed on the DC's.

Will.
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