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"NT Domain Models
You can divide domain controllers into two types-PDCs and BDCs. (For more information about domain controllers, see L.J. Locher, "Understanding PDCs and BDCs," January 2000.) In NT networking, you commonly find three types of configurations for domain controllers. The first configuration is a single domain model, which consists of one domain that holds both user accounts and machine resources. The single domain model is the simplest NT domain model and one of the easiest for you to upgrade.
The second configuration is the
master domain model, in which trust relationships join two or more domains together. The master domain model stores all user accounts and groups for the enterprise in the master domain (sometimes referred to as the accounts domain) and stores physical resources, such as files and printers, in resource domains. Resource domains establish a one-way trust to the accounts domain, so the resource domains can trust users that are in the accounts domain. This type of NT infrastructure is common in medium-sized and large organizations.
The third configuration is the multiple-master domain model, which you typically find in large enterprises with user and group account requirements that approach NT domain limits. The multiple-master domain model contains two or more accounts domains and, typically, multiple resource domains. Each resource domain establishes a one-way trust to each accounts domain. Users whom the accounts domain defines can therefore access resources in the resource domain.
Another domain configuration type, the complete trust model, consists of domains that have two-way trusts between one another within an infrastructure. Because administrators don't commonly use the complete trust model, I concentrate on migrating a master domain model that consists of an accounts domain and a resource domain. You can apply the same principles to migrate a single or multiple-master domain model.
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