A. AMF selects an SGW to serve the UE, and then sets up the required S5-U and S5-C GTP tunnels on the selected SGW.

B. UE initiates an Attach procedure and includes an EPS-GUTI derived from its 5G-GUTI.

C. For any PDU session that supports interworking, the serving SMF provides an SM context that includes mapped EPS bearers to the AMF.

D. AMF uses the EPS-GUTI derived from the UE 5G-GUTI to discover the MME, and then provides the UE context to the MME.

A. UE receives the allowed NSSAI from AMF.

B. AMF receives an AMF set from NSSF.

C. An AMF that supports the requested NSSAI is selected to serve the UE.

D. AMF receives a list of SMFs which support the requested NSSAI from NRF.

A. The UE connects to the network to send uplink data.

B. Power and signaling efficiency is optimized for the UE.

C. The UE performs registration updates.

D. The UE listens and responds to paging.

A. Subscribed NSSAI is a set of slices specified in the UE subscription data and contains only home PLMN values.

B. Requested NSSAI is a set of slices provided by UE to the network and contains values from serving PLMN.

C. Allowed NSSAI is a set of slices provided to UE by AMF during UE registration procedure.

D. Configured NSSAI is a set of slices configured on the AMF and contains slices supported per tracking area.

A. The OAuth 2.0 framework is used to secure the communication between network functions within a PLMN at the network layer.

B. The transport layer security (TLS) performs certification-based authentication, providing connection security between network functions within a PLMN.

C. The security edge protection proxy (SEPP) handles the security of inter-domain SBIs and protects the interaction between network functions in different PLMNs.

D. The network domain security/Internet protocol (NDS/IP) provides confidentiality and data integrity between network functions within a PLMN.