On one AD DC can be only one domain at one time.
So that AD can work it needs DNS with SRV records in it.
Any server on which you have installed Active Directory is a domain controller (DC)
The global catalog is a subset of domain information created for the purpose of enabling domain controllers in other domains in the same forest to locate resources in any domain.
First domain in the entire forest is not only a root domain, but is also the forest root
A client machine may be in only one AD at one time.
If there is a “Everybody” share on the domain folder, access still needs a domain account.
AD components :
- OU – organisational unit
- Namespace (flat or hierarchical)
- Object (may be of different classes)
- Schema – a set of rules that define the classes of objects and their attributes that can be created in Active Directory
- Global catalog – a central information database
Physical : folders, printers, sites, DCs …..