If you create all of your required sites and subnets prior to adding additional domain controllers, the server objects for the additional domain controllers are placed into the appropriate sites based on the subnet information. Creating the sites and subnets first makes the administrator's job easier, because you do not have to do the subnetting calculations to determine to which site a server object should belong and move it there manually.
By comparison, if you create additional domain controllers before you define any new sites, the server objects for the domain
controllers are placed in the Default-First-Site-Name site. When you create new sites, you must manually move the server objects to the site that contains the corresponding subnet.
To move a server object to a new site:
- Open Active Directory Sites and Services from the Administrative Tools menu.
- In the console tree, expand Sites.
- Expand the site that contains the server object that you want to move.
- Right-click the server object, and then click Move. Here, we've expanded the Default-First-Name site, then right-clicked Constellation.