In organization it may have branch offices, stores in different geographical locations. Some of these branch office network infrastructures may not need integrate with the cooperate network. For example if it’s a sales office they may communicate with the Head office just through email or phone. So that branch office network will work as separate independent structure.
But it’s…
In an infrastructure setup, it may have many domain controllers. Some may even in different sites. But in order to keep the consistency in network it’s important to have proper replication between these domain controllers. It is important to plan and optimize the replication process. For example let’s assume you have a remote site which is connect via 256kb link with head office.