Forest
Root directory is the highest level directory and this is the directory that appears first on the screen when you start MS-DOS. Generally, 'C' Drive appears on the MS-DOS screen as root directory.
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.
Active Directory will represent a major advance over NT 4.0's simple domain model, since the domains within Active Directory will be able to form a multi-level tree structure.Users will be able to establish two-way transitive trust relationships among these domains. Lower-level domains trust all the higher-level domains within the hierarchical tree. This arrangement will make trust relationships easier to manage and will make possible the delegation of administrative authority from higher to lower levels within the tree.Active Directory will bear on security in two ways.First, Active Directory will be the repository for security policy information for the enterprise. For example, Active Directory will be able to store domain-wide password restrictions and system access privileges.Second, Active Directory will incorporate the object-based security model, controlling each user or group's right to read or update objects within the directory. The directory will therefore be able to hold such important items as encrypted passwords and user certificates with the assurance that only authorized users will be able to read or change them.
yes it is
Functional levels
Windows 2000 Mixed: This is the default functional level
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In Active Directory, the naming convention primarily follows the Domain Name System (DNS) format. This includes using fully qualified domain names (FQDNs) for domain objects, which typically consist of a domain name followed by a top-level domain (e.g., example.com). Additionally, Active Directory uses distinguished names (DNs) for objects, comprising the object's relative distinguished name (RDN) and its path within the directory hierarchy. This structure helps in uniquely identifying and locating objects within the directory.
Normalization
What are the domain functional level in Windows Server 2003
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The /, or root directory.