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Active
Directory Domain Service (AD DS) can be installed in unattended mode using the
below command line. This is particularly useful when you promote a Windows Server 2008 Server Core installation
to Domain Controller.
The below command
can be used to install an Additional Domain controller in an existing Domain
called ‘test.com’. Make sure you modify the command according to your domain
name, username etc. Please note that the letters in the commands are case sensitive.
Open the
command prompt and type the below commands:
Dcpromo /unattended
/replicaOrNewDomain:replica /replicaDomainDNSName:test.com /ConfirmGC:Yes
/UserName:TEST\Administrator /Password:***** /safeModeAdminPassword:P@ssw0rd

If all the syntax are correct, as you see in the screenshot, you will get a message the Active Directory Domain Services binaries are being installed.