Domain Functional Level and Forest Functional Level on Windows Server 2012

Dear Experts,

Q1)Could you define whats the deference between those two?

Q2)Having a Windows Std 2012 R2 and a Windows Std 2012 as domain
controllers what is the correct functional level for domain and forest?

Thanks in advance
mamelasAsked:
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Scott CSenior Systems EnginerCommented:
Q1:  https://technet.microsoft.com/library/understanding-active-directory-functional-levels(WS.10).aspx

You cannot set the domain functional level to a value that is lower than the forest functional level.

A couple of short training videos.

http://www.itfreetraining.com/70-640/forest-functional-levels/

http://www.itfreetraining.com/70-640/domain-functional-levels/

Q2:  You must always keep the domain/forest functional levels at the lowest common denominator...in this case it would be Server 2012.
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Will SzymkowskiSenior Solution ArchitectCommented:
A domain functional level affects the DOMAIN only. Meaning if you have multiple domains within the same Forest you can have different Domain Funcitonal levels based on what type of DC's are in the specific domain.

Forest Functional Level affects ALL of the domains within the Forest. You can only raise the domain or forest fucntional level to the lowest server that is acting as a DC.

So if you had the following domain controllers
- 2003
- 2008
- 2008R2
- 2012

You could only have a domain/forest functional level of 2003.

So based on your initial question 2012 would be the forest/domain functional level that you could go to.

Will.
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mamelasAuthor Commented:
Thank you both for your in-detail answers!
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Scott CSenior Systems EnginerCommented:
You're welcome.  You're welcome.
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