Question: In a 5G network, what is the application layer signalling protocol used for the F1-C control plane interface between the gNB-DU and gNB-CU or gNB-CU-CP?
Option 1: TCP (Transmission Control Protocol)
Option 2: HTTP (Hypertext Transfer Protocol)
Option 3: Diameter
Option 4: NG-AP (NG Application Protocol)
Explanation: The correct answer is NG-AP because, according to the specifications for 5G network architecture, the F1-C interface utilizes NG-AP at the application layer for signalling between the gNB-DU and the gNB-CU or its control plane part (gNB-CU-CP), which is crucial for efficiently managing and orchestrating resources within the 5G RAN architecture.