Understanding How Clients Locate Content
The Configuration Manager infrastructure along with Active Directory (AD) integration provides clients with the ability to roam the entire Configuration Manager infrastructure and find the closest Distribution Point (DP) to receive content. A client will attempt to get content from a Resident Distribution Point before a remote Distribution Point.
Global roaming can be achieved when the Active Directory schema has been extended. If the schema hasn’t been extended, then only regional roaming is available. Regional roaming only allows client roaming to sites lower in the hierarchy. If the client roams to a peer site, or a parent site, content cannot be downloaded from Resident Distribution Points.