Active Directory (AD) sites, which consist of well-connected networks defined by IP subnets that help define the physical structure of your AD, give you much better control over replication traffic and authentication traffic than the control you get with Windows NT 4.0 domains. Because AD relies on IP, all LAN segments should have a defined IP subnet. This makes creating your AD site structure straightforward; you simply group well-connected subnets to form a site.

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