The Node module has one entity, the global node entity, which crowns the
   hierarchy represented in the entity model described by the Digital Network
   Architecture. All other entities are subordinate to the Node entity. When
   enabled, each node is visible to all other nodes on the network. Access to
   a node's entities must be made through the node.

   The following shows the hierarchical relationship of the Node global entity
   to all of the other local entities.

                             Node
                              Event Dispatcher
                              Alias
                              Session Control
                              NSP Transport
                              OSI Transport
                              Routing
                              MOP
                              CSMA-CD
                              FDDI
                              DDCMP
                              HDLC

   The node entity is the only entity in the Node module.