A. To use an answer file when promoting a DC using the install-from-media function, you must add the following two lines to your answer file:

ReplicateFromMedia=yes
ReplicationSourcePath=c:\NTDSRestore

The second line must contain the path to the location of the DC backup restored files. For example, an answer file might look like

\[Unattended\]
Unattendmode=fullunattended

\[DCINSTALL\]
UserName=
Password=
UserDomain=
DatabasePath=c:\windows\ntds
LogPath=c:\windows\ntds
SYSVOLPath=c:\windows\sysvol
SafeModeAdminPassword=
CriticalReplicationOnly=No
SiteName=
ReplicaOrNewDomain=Replica
ReplicaDomainDNSName=
ReplicationSourceDC=
ReplicateFromMedia=yes
ReplicationSourcePath=c:\NTDSrestore
RebootOnSuccess=yes

To use this answer file, enter the command

dcpromo /adv /answer:

Be aware that if you use an answer file for a second time to perform another unattended installation, the passwords will be blank and you'll be prompted to re-enter them. The Dcpromo process removes the passwords from the file each time for security reasons.