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Windows Server 2003 in a Nutshell by Mitch Tulloch

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Name

Site—Concepts

Synopsis

While a domain is a logical grouping of computers connected for administrative purposes, a site is a physical grouping of computers that are well-connected to one another from the point of view of network bandwidth. Specifically, a site must consist of computers that:

  • Run the TCP/IP protocol and are located on one or more subnets

  • Are joined by a high-speed network connection, typically a LAN connection of 10-Mbps or greater with a high available bandwidth, but in some cases slower dedicated WAN connections

Sites are created within Active Directory to mirror the physical layout of a large network. Sites consist of one or more subnets and should mirror the physical connectivity of your network. Computers joined by LAN connections typically form a site, while slower WAN connections form the boundaries between different sites. You thus might have a Vancouver site, a Seattle site, and so on within your enterprise. Sites and domains don’t need to correspond in a one-to-one fashion. For example, one domain may span several sites, or one site may span several domains.

Site Terminology

You need to understand a few other concepts to work with sites:

Site link

A connection between two sites that involves:

Cost

This is a number used to determine which site link will be preferred for replication when two sites are connected by multiple site links. The higher the cost number assigned to a site link, the lower the priority of the link as far as replication is concerned. A cost ...

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