A.
This network function stores or retrieves subscriptions, profiles and authentication data to or from the data repositories. It offers services to the AMF, SMF, NEF and AUSF using the Service Based Interface.
B.
This network function supports authentication for 3GPP and non-3GPP accesses.
C.
This network function is part of data repositories in the Common Data Layer and in opposition to the UDR, it stores non-standardized unstructured data.
D.
This network function provides registration and discovery functionality to enable other network functions/services to discover and communicate with each other.
Explanation:
Unified Data Management (UDM) is a core network function in the 5G Service-Based Architecture (SBA). It plays a critical role in:
Managing subscription data
Providing user profile information
Supporting authentication and authorization functions
Interacting with other network functions such as AMF (Access and Mobility Management Function), SMF (Session Management Function), NEF (Network Exposure Function), and AUSF (Authentication Server Function) via the Service-Based Interface (SBI)
The UDM works closely with the UDR (Unified Data Repository), which stores the actual data, while the UDM handles logic and access control.
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