Question: In a 5G Network, which entity typically requests the UPF(s) and NG-RAN to perform GTP-U path QoS monitoring when this feature is enabled?
Option 1: AMF (Access and Mobility Management Function)
Option 2: SMF (Session Management Function)
Option 3: NFVO (Network Functions Virtualization Orchestrator)
Option 4: PCF (Policy Control Function)
Explanation: The Session Management Function (SMF) is responsible for managing sessions, including the control of user plane traffic and QoS (Quality of Service). Therefore, when GTP-U path QoS monitoring is enabled, it logically falls under the SMF's responsibilities to request the User Plane Function (UPF) and Next-Generation Radio Access Network (NG-RAN) to perform such monitoring. This ensures consistent management of service quality across the network.