Check: Is this domain controller a global catalog?
If you want to know whether a domain controller with a given name is a global catalog or not, you can verify this with the following script:
dcName = "NAME_OF_THE_SERVER_TO_CHECK" 'insert the name of your own server here
Const NTDSDSA_OPT_IS_GC = 1
Set rootDSE = GetObject("LDAP://" & dcName & "/rootDSE")
dcDN = objRootDSE.Get("dsServiceName")
set dcObj = GetObject("LDAP://" & dcName & "/" & dcDN)
options = dcObj.Get("options")
If options And NTDSDSA_OPT_IS_GC Then
WScript.Echo dcName & " is a global catalog"
Else
Wscript.Echo dcName & " is not a global catalog"
End If
