Each object in Active Directory Domain Services contains a set of attributes that define the characteristics of the object. Each attribute is described by an attributeSchema object in the schema container that defines the attribute.
type of attributes that are stored in Active Directory Domain Services:
Domain-replicated, stored attributes : stored in the directory (such as cn, nTSecurityDescriptor, and objectGUID) and replicated to all domain controllers in a domain. A subset of these attributes is also replicated to the global catalog.
Non-replicated, locally stored attributes: Non-replicated attributes, such as badPwdCount, Last-Logon, and Last-Logoff are stored on each domain controller, but are not replicated. The non-replicated attributes are attributes that pertain to a particular domain controller.