Being Active directory Administrator, you should know what is you Forest Functional level(FFL) and Domain Functional Level(DFL). It is very much required for the applications and add-on features of active directory.

Use below command to get Forest Functional Level(FFL)

                                          Get-ADForest | fl Name,ForestMode


Use below command to get Domain Functional Level(DFL)

                                         Get-ADForest | fl Name,DomainMode


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