What happens when the first DC goes down? You can’t add or delete employees until it comes back up again. In the above case, if only the first DC was in charge of adding and removing employees and the second DC was in charge of security, then such a conflict wouldn’t have occurred. In this model, only one domain controller (DC) could perform a particular type of update. To prevent such conflicts, a single-master model was introduced. This means, the new employee was no longer in the system and couldn’t access the system’s resources, which is obviously not right. The conflict management system that existed then followed the “last writer wins” policy, so the change made by the second domain controller was valid while the change made by the first domain controller was discarded. Accidentally, it deleted this employee from the AD as well. A few seconds later, another domain controller wanted to delete the records of employees who no longer worked in the enterprise. Since the change was made to the AD, it was reflected throughout the enterprise, and that’s fine.
For example, let’s say, a domain controller added a new employee to the database. In the initial versions of AD, there were many chances for conflicts. This central repository automates many tasks such as management of user data, provision of security, and inter-operations with other directories. You can imagine AD as a database or a safe location that stores all the attributes of your users such as usernames, passwords, and more.
MOVE PDC TO NEW SERVER WINDOWS
Active Directory (AD) is a directory service created by Microsoft, and it comes as a set of processes and services in most versions of Windows Server operating systems.
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