I did some search on this already but still don't understand it. Can someone explain their differences as simple as possible? It seems like they do pretty much the same thing....
2 Answers
Kerberos specifies that authentication come from a known machine with a timestamp that matches the authentication server (domain controller). The computer password is how AD ensures that the machine is known. It's not available to the user.
This answer might help.
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One is for the user, the other for the computer that is joined to the domain.
Computers also need accounts for certain operations - among other things being allowed to even interact with active directory, or loading their group policies (which are not tied to a user in their storage). So, when you join a computer to a domain, it is getting its own account to do so (and automatically manages its password).
Try finding a book on Active Directory to give you a good introduction to the basics.
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