However, there are some YANG modules that are required for RFC conformance or server operation, so they are built into the server code.
|Top-Level Data Node||YANG Module||RFC||Description|
|<modules-state>||ietf-yang-library||RFC 7895||YANG Module Inventory for the server. Required for YANG conformance information for RESTCONF and all YANG 1.1 modules.|
|<nacm>||ietf-netconf-acm||RFC 6536||NETCONF Access Control Model (NACM) for all protocols. Required for NACM conformance. Configuration also supported. Enforcement enabled by default. Retrieval for superuser only by default.|
|<netconf>||nc-notifications||RFC 5277||NETCONF Streams supported by the server for use with <create-subscription>. Required for NETCONF Notifications conformance.|
|<netconf-state>||ietf-netconf-monitoring||RFC 6022||NETCONF Protocol information. Required for NETCONF Monitoring conformance|
|<restconf-state>||ietf-restconf-monitoring||RFC 8040||RESTCONF Protocol information. Required for RESTCONF Protocol conformance|
|<system>||yuma-system||Netconf Central||Yuma System Monitoring module. Not required for conformance. This module will be replaced soon by the IETF version in RFC 7317|