In the Huawei CloudCampus Solution, the architecture is typically divided into themanagement layerand thenetwork layer. The management layer, represented by platforms such as iMaster NCE-Campus, is responsible for centralized configuration, monitoring, policy delivery, and intelligent O&M. Communication between these two layers relies on standardizedmanagement and control protocols.

NETCONFis a key protocol used between the management layer and network devices. It provides a structured and reliable mechanism for delivering configurations, querying device status, and performing automated service deployment. NETCONF works closely with data models to ensure consistency and accuracy in configuration management.

SNMPis also widely used in the CloudCampus Solution for monitoring and fault management. Through SNMP, network devices report performance data, alarms, and status information to the management platform, enabling real-time visibility and proactive maintenance.

YANGis not a transport protocol but a data modeling language; however, it plays a critical role in management-layer communication. YANG models define the structure of configuration and operational data exchanged between the controller and devices, typically carried over NETCONF. Therefore, YANG-related information is effectively exchanged between the management and network layers.

RADIUS, on the other hand, is used for user authentication, authorization, and accounting. It operates between network devices and authentication servers, not between the management layer and the network layer.

Thus, the correct options areNETCONF, SNMP, and YANG.