no its is not possible . OUs of the same name in different domains are independent..
Organizational Units appear within a top-level Organization grouping or Organization certificate, called a Domain. In many systems one OU can also exist within another OU. When OUs are nested, as one OU contains another OU, this creates a relationship where the contained OU is called the child and the container is called the parent. Thus, OUs are used to create a hierarchy of containers within a domain. Only OUs within the same domain can have relationships.
Active Directory organizes multiple domains hierarchically in a forest. A forest is the top-level structure in Active Directory that contains multiple domains. Each domain within a forest has its own security policies and trust relationships with other domains in the forest.
The four types of Active Directory container objects are Organizational Units (OUs), domains, sites, and the built-in container. Organizational Units are used to organize users, groups, and devices for management and delegation of permissions. Domains represent a logical group of objects within the directory, while sites are used to manage replication and network topology. The built-in container holds default groups and accounts that are created with Active Directory.
3 as it is the minimum amount of domains in anything. I think this is for and Active Directory Tree !
alphabetical order
A collection of domains that share a common schema.
The Active Directory administrative tools can only be used from a computer with access to a domain. The following Active Directory administrative tools are available on the Administrative Tools menu: Active Directory Users and Computers (dsa.msc) Active Directory Domains and Trusts (domain.msc) Active Directory Sites and Services (dssite.msc)
Active Directory Domains And Trusts console
A collection of domains that share a common schema
Open Active Directory Users and Computers.In the console tree, right-click the folder in which you want to add an organizational unit. Where?Active Directory Users and Computers/domain node/folderPoint to New, and then click Organizational Unit.Type the name of the organizational unit.
Active Directory NC (Naming Context's) * Active Directory consists of three partitions or naming contexts (NC) ** Domain, Configuration and Schema Naming Contexts * Each are replicated independently * An Active Directory forest has single schema and configuration ** Every domain controller (DC) holds a copy of each (schema, configuration NC's) * Forest can have multiple domains ** Every domain controller in a domain holds a copy of the domain NC
Organisational Unit: A part of Active Directory used to Organise and Manage the objects of ADAn organizational unit (OU) is a subdivision within an Active Directory into which you can place users, groups, computers, and other organizational units. You can create organizational units to mirror your organization's functional or business structure. Each domain can implement its own organizational unit hierarchy. If your organization contains several domains, you can create organizational unit structures in each domain that are independent of the structures in the other domains.The term "organizational unit" is often called as "OU" in casual conversation. "Container" is also often applied in its place, even in Microsoft's own documentation. All terms are considered correct and interchangeable.
Active Directory NC (Naming Context's)Active Directory consists of three partitions or naming contexts (NC) Domain, Configuration and Schema Naming ContextsEach are replicated independentlyAn Active Directory forest has single schema and configuration Every domain controller (DC) holds a copy of each (schema, configuration NC's)Forest can have multiple domains Every domain controller in a domain holds a copy of the domain NC