Active Directory Domain Services (just called Active Directory in those days) was released with Windows Server 2000 and was based upon the X.500 hierarchical network standard that companies such as Novel’s NDS and Banyan Vines were using at the time.ĪD DS also used DNS as its name resolution system and the TCP/IP communication protocols in use on the internet. NT4 Domains also primarily used NetBIOS (another flat file, Microsoft specific system) for its name resolution.įor a lot of larger organizations, this necessitated multiple domain databases with very limited and complicated interactions between those domains. The NT4 domain model in 2000 was straining at the seams to keep up with evolving corporate structures, hampered by some quite severe limitations – maximum of 26,000 objects in a flat file “bucket”, only 5 kinds of fixed objects whose structure (properties etc.) could not be changed, maximum size of the database of 40Mb etc. Let’s start with a recap of what AD DS is.Īctive Directory Domain Services was introduced as a hierarchical authentication and authorization database system to replace the flat file Domain system in use on NT4 and previous servers. Most of us have probably worked with it for years, and now you’re looking to move to the cloud and understand what AAD is. Let me educate you □ What is Active Directory? So let’s compare AD DS (and particularly the domain services part of AD DS) to AAD. IT admins expect (not unexpectedly) to be able to use Azure AD just like they have always used Active Directory Domain Services. The number one question I get asked: “How do I join my servers to Azure AD?”. Azure Active Directory is NOT a cloud version of Active Directory Domain Services, and in fact, it bears minimal resemblance to its on-premises names at all. Is Azure Active Directory (AAD) the same as Active Directory Domain Services (AD DS). Here is a subject I hear and get asked over and over again.
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