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Answer Posted / sarav
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.
Creating AD sites benefits you in several ways, the first
of which is that creating these sites lets you control
replication traffic over WAN links. This control is
important in Windows 2000 because any Win2K domain
controller (DC) can originate changes to AD. To ensure that
a change you make on one DC propagates to all DCs, Win2K
uses multimaster replication (instead of the single-master
replication that NT 4.0 uses). You might think that
multimaster replication would make it difficult to plan for
AD replication’s effect on your WAN links, but you can
overcome this obstacle using AD sites. . .
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