Windows Server® 2012 Unleashed
by Rand Morimoto, Michael Noel, Guy Yardeni, Omar Droubi, Andrew Abbate, Chris Amaris
Subnets
Subnets define the network boundaries of a site and limit WAN traffic by allowing clients to find local services before searching across a WAN link. Many administrators do not define subnets for locations that do not have local servers; instead, they relate site subnets only to Active Directory domain controller replication.
If a user workstation subnet is not defined within Active Directory, the workstation picks another domain controller essentially at random. The domain controller could be one from the same physical location or it could be one on another continent across multiple WAN links. The user workstation might authenticate and download policies or run services from a domain controller that is not directly connected to the same ...
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