Active Directory Basic - Active Directory Origin

When it comes to Active Directory, the most interesting thing to remember is the "directory" under DOS, the "path" and the "folder" under Windows 9X/ME, the "directory" at that time. "" or "folder" only represents the location and hierarchical relationship of a file on the disk. After a file is generated, the directory of the file is fixed. (Of course, you can delete, transfer, etc., and now do not consider these) That is to say, its properties are relatively fixed and static. This directory can only represent the storage location of all files in this directory and the total size of all files, and can not get other relevant information, which affects the efficiency of the overall use of the directory, which affects the overall efficiency of the system. Make the entire management of the system complicated. Because there is no correlation, the same object has to be configured multiple times in different applications, which is quite complicated to manage and affects the efficiency of system resources. In order to change this inefficient relationship and strengthen the relationship with the relevant protocols on the Internet, Microsoft decided to comprehensively reform in WIN2K, which is to introduce the concept of Active Directory. The key to understanding the Active Directory is the word "activity". Don't remove the word "activity" and just understand it from the "directory". Then you and I must still be able to leave the original. The directory under DOS or the folder under Windows9x, because this directory is active, it is dynamic, it is a directory containing service functions, it can do "association and mapping", such as Once you find a username, you can think of all the basic information such as its account number, birth information, E-mail, phone number, etc., although the files that make up this information may not be in one piece. At the same time, different information can be shared between different applications, which reduces the waste of system development resources and improves the utilization efficiency of system resources.

Active Directory includes two aspects: catalog and directory-related services. A directory is a physical container for storing various objects. From a static perspective, this Active Directory is not essentially different from the "directory" and "folder" we have previously met. It is just an object, an entity; Directory service is a service that makes all the information and resources in the directory work. Active Directory is a distributed directory service. Information can be distributed on multiple different computers to ensure users can access quickly because multiple machines have the same information. Therefore, it has strong control over information, so that users are provided with a unified view regardless of where they are accessed or where the information is located.