What is AD?

AD is a distributed database which organizes, manages, and controls the network resources. It‘s provides single point of administration to administer the object in directory and their appropriate membership and permissions. Enables a single administrator to centrally manage resources such as AD users and computers, AD sites and services, AD Domain and Trusts and Group policy settings and OU.At the file level, AD stores its database in a single database file named Ntds.dit, a copy of which can be found on every domain controller.Viewing the AD Schema: To use this snap-in, you need to manually register it by selecting Start, Run (or entering a command-prompt session), and typing ‖regsvr32 schmmgmt.dll‖ you can open an MMC session and choose Add/Remove Snap-in from the Console menu, then select Active Directory Schema from the Add Standalone Snap-In dialog boxTo modify the AD schema, you need to use a different utility: the MMC ADSI Edit snap-in. ADSI Edit is essentially a low-level AD editor that lets you view, change, and delete AD objects and object attributes. In terms of usefulness and potential danger, ADSI Edit is to AD what the regedit or regedt32 registry editors are to the system registry. To use the ADSI Edit utility to make schema modifications, you first need to be a member of the Schema Admins group.Run – CMD type this ---regsvr32 adsiedit.dll