Its a Folder
The /, or root directory.
root directory
The Linux kernel is the central component of the GNU/Linux operating system. The kernel is the lowest level of interaction between the hardware and the operating system. Individual applications are at a higher level. The kernel along with supporting applications make up the operating system.
Unlike Windows, Linux has a unified file system. In Windows, all paths start with a drive letter, like C: ( C:\Users\Joe\Documents\readme.txt ) A flash drive may mount as F:, and a CD may mount as E:. In Linux, there are no drive letters, and all paths begin from the root directory (/) ( /home/joe/readme.txt ) Storage devices will instead mount to folders. A flash drive may mount to /media/Lexar So, to answer your question, Linux only has one directory tree, the uppermost level of which is known as the file system's root.
what is the lowest level of the CNS
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.
There is no specific lowest level of metabolism.
The lowest level is the cell.
The lowest point in Somerset is in the village of Cheddar, located within the Cheddar Gorge. The lowest point is at the bottom of the gorge, where the land sits around 46 meters above sea level.
The lowest level is the Outcastes ("untouchables")
the lowest level is genin and the highest level is kage.
The Troposphere is the lowest level of Earth's Atmosphere.