How DC authenticates when Client is not using any authentication?

Question

I have a virtual environment with the following structure:

• DC: Windows Server 2008
• Client: Windows 7

I installed Active Directory on the Windows Server 2008 and made it in domain januapp.local, then I joined the client which uses local authentication with username and password utkarsh to the domain by using the DC administrator username and password. It perfectly added it to the domain januapp.local.

So, when I restart the client machine and logged in using the same username and password, utkarsh, it logged me into the domain januapp.local. So, all was good there.

Problem Starts here

But, then I tried to join my main domain on Windows 10 to the same domain januapp.local using the administrator username and password.

Note: On that Windows 10, I didn't set any authentication to log me in.

When I restart the PC, on the main screen I got another user new login option in right lower left. When I go there it asks me to type the authentication credentials to join januapp.

At that point I didn't have any special authentication credentials; I only used the administrator username and password to join Windows to the domain.

Are the administrator username and password required? I tried, but it says username and password are not valid.

Then, what kind of username and password are required?

Answer 1

1. When you logged onto the workstation with the local user account you did NOT log into the domain. Your workstation is joined to the domain but your local user is NOT logged into the domain.

2. If you want to log into the domain then you need to create a user account in the domain. You then need to log into the domain from your workstation with the domain user account.

3. You can very well log into the domain from your workstation with the domain Administrator user account. There's nothing preventing you from doing that.