Active Directory domains are named using the Domain Name Service (DNS) namespace. The domains that are part of a common DNS namespace are considered to be in the same domain tree. For example, the amer.rallencorp.com, emea.rallencorp.com, and rallencorp.com domains are part of the rallencorp.com domain tree. A single domain tree is sufficient for most implementations, but one example when multiple domain trees are necessary is with large conglomerate corporations. Conglomerates are made up of multiple individual companies. Each company typically wants to maintain its own identity and, therefore, its own namespace. Describing the conglomerate scenario is a good way to show the relationships between forests, domains, domain trees, and trusts.
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