You are the administrator of an organization with a single Active Directory domain. A user who left the company returns after 16 weeks. The user tries to log onto their old computer and receives an error stating that authentication has failed. The user's account has been enabled. You need to ensure that the user is able to log onto the domain using that computer. What do you do?

A) Reset the computer account in the Active Directory. Disjoin the computer from the domain and then rejoin the computer to the domain.
B) Run the ADadd command to rejoin the computer account.
C) Run the MMC utility on the user's computer, and add the Domain Computer's snap-in
D) Re-create the user account and reconnect the user account to the computer account.

Active Directory Domain can be defined as a Microsoft Active Directory network having a collection of objects in itself. Object can be a single user or a group of users or it may be a hardware components such as printer or scanner. The database of each object is stored into the domain having information about the identity.

Problem:

Now according to the given scenario, the identity of the user,s computer will be disabled when he will left the company. After 16 weeks when he will try to log in back from his computer, there will be an authentication error. The user will still not able to login after manually enabling his account.

Process:

You will have to go to the Active Directory Domain and dis-join the former domain and then reset the account after that rejoin the user's computer to the domain again. Now the user will be able to log in to the computer.

I Hope it will help you!