Active Directory Domain Functional Levels and steps to raise them



What are the  Functional Levels?


Functional Levels in Windows Server


Domain Functional level of the forest can be chosen when the active directory domain server is deployed. It is necessary that the domain functional level should always be chosen higher or at the same level as compared to the forest functional level.

If in a network, there are three domain controller servers such as 2008, 2003, and 2000 than on all domain controllers forest functional level should be set on in 2000. The benefit to keep a functional level at 200, is that the domain controller with 2000 can work with other 2003 and 2008 domain controller servers but the main disadvantage is the latest features that comes with 2003 and in 2008.

We cannot use them. at the time of installation we can leave it as default but later we can raise the functional level but cannot go down to the default functional level when we onetime raise the level. Ideally it is considered that all the servers in a domain should be the latest.

Raising Domain Functional Level 

  • Go to Start Menu and Go to Administrative Tools
  • Select the Server Manager
  • Expand the Roles and expand the Active Directory Domain Services
  • Expand the Active Directory Users and Computers
  • Right Click on the domain engineer.com
  • Select the 5th option Raise Domain Functional Level
  • A new window will open, select on domain functional level in the middle of the window and set it as per requirement such as 2003,2008,2008R2 because at the time of installation we set it in 2000. But keep once again in mind that it cannot be reversed

OR

  • Go to Start Menu and Go to Administrative Tools
  • Select the Active Directory Domains and Trusts
  • Right-click on the engineer.com and select the Raise domain Functional level
  • Select the 5th option Raise Domain Functional Level
  • A new window will open select on domain functional level in the middle of the window and set it as per requirement such as 2003,2008,2008R2 because at the time of installation, we set it at         

Raising Forest Functional Level


  • Go to Start Menu and Go to Administrative Tools
  • Select the Active Directory Domains and Trusts
  • Right-click on the Active Directory Domain and Trusts and select the Raise Forest Functional Level
  • Select the 4th option Raise Domain Functional Level
  • A new window will open select on domain functional level in the middle of the window and set it as per requirement such as 2003,2008,2008R2 because at the time of installation we set it in 2000. But keep once again in mind that it cannot be reversed

Suppose we have a scenario in which in a forest  domain 1 has three servers such as 200,2003, and 2008 and another domain 2 with servers 2003, and 2008 so in domain 1 we need to keep the domain functional level at 200 and in domain 2 we need to keep domain functional level at 2003 but at the forest level we need to keep the Forest Functional Level at 2000 such that the users of domain 2 can use the features of 2003 and also can communicate with domain 2.

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