38.Domain Name Functional Level

Applies To: Windows Server 2008, Windows Server 2008 R2, Windows Server 2012

Functional levels determine the available Active Directory Domain Services (AD DS) domain or forest capabilities. They also determine which Windows Server operating systems you can run on domain controllers in the domain or forest. However, functional levels do not affect which operating systems you can run on workstations and member servers that are joined to the domain or forest.

When you deploy AD DS, set the domain and forest functional levels to the highest value that your environment can support. This way, you can use as many AD DS features as possible. For example, if you are sure that you will never add domain controllers that run Windows Server 2003 to the domain or forest, select the Windows Server 2008 functional level during the deployment process. However, if you might retain or add domain controllers that run Windows Server 2003, select the Windows Server 2003 functional level.

When you deploy a new forest, you are prompted to set the forest functional level and then set the domain functional level. You cannot set the domain functional level to a value that is lower than the forest functional level. For example, if you set the forest functional level to Windows Server 2008, you can set the domain functional level only to Windows Server 2008. The Windows 2000 native and Windows Server 2003 domain functional level values are not available on theSet domain functional level page of the Active Directory Domain Services Installation Wizard. In addition, all domains that you subsequently add to that forest have the Windows Server 2008 domain functional level by default.

You can set the domain functional level to a value that is higher than the forest functional level. For example, if the forest functional level is Windows Server 2003, you can set the domain functional level to Windows Server 2003, Windows Server 2008, or Windows Server 2008 R2.

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Er Ratnesh Porwal
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