* R-22700 The VNF **MUST** conform its YANG model to RFC 6470, “NETCONF Base Notifications”.
* R-10353 The VNF **MUST** conform its YANG model to RFC 6244, “An Architecture for Network Management Using NETCONF and YANG”.
* R-53317 The VNF **MUST** conform its YANG model to RFC 6087, “Guidelines for Authors and Reviewers of YANG Data Model Documents”.
-* R-33955 The VNF **SHOULD** conform its YANG model to \*\*RFC 6991, “Common YANG Data Types”.
+* R-33955 The VNF **SHOULD** conform its YANG model to RFC 6991, “Common YANG Data Types”.
* R-22946 The VNF **SHOULD** conform its YANG model to RFC 6536, “NETCONF Access Control Model”.
* R-10129 The VNF **SHOULD** conform its YANG model to RFC 7223, “A YANG Data Model for Interface Management”.
* R-12271 The VNF **SHOULD** conform its YANG model to RFC 7223, “IANA Interface Type YANG Module”.
R-42366: The VNF **MUST** support secure connections and transports.
-R-33955: The VNF **SHOULD** conform its YANG model to \*\*RFC 6991, “Common YANG Data Types”.
+R-33955: The VNF **SHOULD** conform its YANG model to RFC 6991, “Common YANG Data Types”.
R-33488: The VNF **MUST** protect against all denial of service attacks, both volumetric and non-volumetric, or integrate with external denial of service protection tools.