4A0-M10 Online Practice Questions and Answers

Which of the following statements regarding cloud RAN architecture is FALSE?

A. The gNB is split into three functional modules: a radio unit (RU), a distributed unit (DU), and a centralized unit (CU).

B. DU performs the non-real time processing of layer 2.

C. The fronthaul segment connects RU to DU and the midhaul segment connects DU to CU.

D. CU can be deployed in the cloud as a VNF.

A UE has a PDU session established using slice 1. The operator removes slice 1 from the UE subscription data stored in UDM. Which of the following actions is NOT performed as a result?

A. UDM notifies the serving AMF about the UE subscription data modification.

B. AMF initiates the UE configuration update procedure.

C. AMF requests the UE to release the established PDU session.

D. UE updates its slicing information with the data received from AMF.

Which of the following statements about QoS profiles used in 5G is FALSE?

A. SMF derives the QoS profile of a QoS Flow from a PCC rule and sends it to NG-RAN.

B. NG-RAN uses the QoS profiles to create mapping between QoS Flow IDs and data radio bearers.

C. NG-RAN sends the QoS profiles and corresponding QoS Flow IDs to the UE.

D. Each QoS profile includes a 5G QoS Identifier (5QI) and an Allocation and Retention Priority (ARP).

Which of the following statements about session aggregate maximum bit rate (session-AMBR) is FALSE?

A. Session-AMBR limits the aggregate bit rate provided across all non-GBR QoS Flows of a PDU session.

B. SMF calculates the session-AMBR value to be enforced.

C. The UPF that terminates the N6 interface enforces the session-AMBR value in the downlink direction.

D. NG-RAN enforces the session-AMBR in the uplink direction.

A UE is handed off from gNB1 to gNB2 using an N2-based handover procedure. The source I-UPF is to be relocated and an indirect data forwarding path is to be used. Which of the following statements is TRUE?

A. AMF decides that an in indirect data forwarding path is required and sends an indication to SMF.

B. gNB2 tunnel info is allocated for the indirect forwarding path and is included in the Handover Request Ack message sent to AMF.

C. Target I-UPF tunnel info is allocated for the indirect forwarding path and is provided to the UPF PSA.

D. UPF PSA tunnel info is allocated for the indirect forwarding path and is provided to the source I-UPF.

In which of the following scenarios is the Service Request procedure performed?

A. A deregistered UE needs to register with the network.

B. A registered UE receives a paging request from the network.

C. A registered UE needs to establish a new PDU session.

D. A deregistered UE needs to connect to the network using non-3GPP access.

The exhibit below displays a packet capture of the PFCP Session Modification Request message sent during a PDU Session Establishments procedure. What do the highlighted TEID and IP Address refer to?

A. The N3 TEID allocated by gNB and the gNB IP address.

B. The N3 TEID allocated by UPF and the UPF IP address.

C. The N3 TEID allocated by SMF and the SMF IP address.

D. The N3 TEID allocated by SMF and the UPF IP address.

When an idle UE moves from EPS to 5GS, which procedure is performed?

A. Registration

B. Tracking Area Update

C. Initial Attach

D. Service Request

Which of the following statements about 5G QoS Flows is FALSE?

A. A QoS Flow is the finest granularity of QoS differentiation within a PDU session.

B. A PDU session has one or more QoS Flows.

C. All QoS Flows of a PDU session are served by a single N3 GTP-U tunnel.

D. Each QoS Flow is served by a dedicated data radio bearer.

Which of the following statements about the downlink user plane data flow in Option 3X is FALSE?

A. Data packets of bearers that do not use dual connectivity are sent from EPC to UE through eNB.

B. When NR coverage is good, data packets of bearers that use dual connectivity are sent from EPC to UE using secondary cell group bearers.

C. When NR coverage degrades, the gNB decides when to use split bearers and send some of the packets received from the core through eNB.

D. When NR coverage is poor, data packets of bearers that use dual connectivity are sent to the UE through eNB.