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Nokia 5G Packet Core Architecture Sample Questions:

1. Which of the following actions is performed when an idle UE moves from 5GS to EPS and the N26 interface is used?

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) For any PDU session that supports interworking, the serving SMF provides an SM context that includes mapped EPS bearers to the AMF.
C) AMF uses the EPS-GUTI derived from the UE 5G-GUTI to discover the MME, and then provides the UE context to the MME.
D) UE initiates an Attach procedure and includes an EPS-GUTI derived from its 5G-GUTI.

2. A connected UE moves from 5GS to EPS using the inter-system handover procedure with N26 interface.
Which of the following actions is NOT performed?

A) Indirect downlink data forwarding paths are established from source gNB to target eNodeB.
B) Source AMF sends a Forward Relocation Request message to the target MME and provides session management contexts.
C) Source gNB sends an NGAP Handover Required message to source AMF with handover type set to
"NRtoLTE".
D) Source AMF obtains session management contexts stored in UDM+HSS for each PDU session that supports interworking.

3. The exhibit below illustrates signaling messages exchanged during a 5GS to EPS Handover procedure using N26. Which information is NOT provided to AMF in step 6 for a PDU session that supports interworking?

A) PGW-U S5-U tunnel info for each EPS bearer
B) PGW-C S5-C tunnel info for the corresponding PDN connection
C) PGW-U indirect data forwarding tunnel info for the corresponding PDN connection
D) EPS bearer ID and QoS parameters for each EPS bearer

4. Which of the following statements about the protection of service-based interfaces (SBIs) is FALSE?

A) The transport layer security (TLS) performs certification-based authentication, providing connection security between network functions within a PLMN.
B) The security edge protection proxy (SEPP) handles the security of inter-domain SBIs and protects the interaction between network functions in different PLMNs.
C) The OAuth 2.0 framework is used to secure the communication between network functions within a PLMN at the network layer.
D) The network domain security/Internet protocol (NDS/IP) provides confidentiality and data integrity between network functions within a PLMN.

5. 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.

Solutions: