network. These are the control kernel, the network
interfaces, the file systems, the system extension, and
the system services.
The control kernel coordinates the various
functions and processes of the network. The network
interfaces provide the low-level subnet protocols for
bridging hardware devices with the network operating
system.
The file systems module controls the
methods of organizing, storing, and retrieving data
from the various types of storage systems used by the
network. System extensions are defined by the
network operating system manufacturers to allow
third party modifications to the operating systems.
This allows the network user to customize the
network. The network services module contains all
the functions that do not fit in any of the other
subsystems.
These include, but are not limited to,
system security, system reliability, error conditions,
and access violations.
6-16
