Nokia Nokia Certification 4A0-M10 Questions & Answers

• Question 21:

  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.

  Correct Answer: A

• Question 22:

  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.

  Correct Answer: C

• Question 23:

  Which of the following best describes the Secondary Node Addition procedure?

  A. Used to transfer bearer contexts from the master eNB to the secondary gNB.

  B. Used to establish a UE context at the gNB for a UE that supports option 3X.

  C. Used to establish connectivity from the gNB to the EPC.

  D. Used to establish an X2 connection between the eNB and gNB.

  Correct Answer: D

• Question 24:

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

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

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

  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.

  Correct Answer: C

• Question 25:

  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 indirect data forwarding tunnel info for the corresponding PDN connection

  B. PGW-C S5-C tunnel info for the corresponding PDN connection

  C. PGW-U S5-U tunnel info for each EPS bearer

  D. EPS bearer ID and QoS parameters for each EPS bearer

  Correct Answer: D

• Question 26:

  Which of the following statements about the 5G-globally unique temporary identity (5G-GUTI) is FALSE?

  A. The 5G-GUTI provides a clear identification of the UE without revealing the UE permanent identity.

  B. The 5G-GUTI contains an element identifying the AMF which allocated it.

  C. The 5G network pages an idle UE using its 5G-GUTI.

  D. During the initial registration procedure, the AMF allocates a 5G-GUTI and sends it to the UE.

  Correct Answer: A

• Question 27:

  A UE triggers an initial registration procedure to use services offered by a 5G network. Which of the following actions is NOT performed as a result of this procedure?

  A. AMF interacts with AUSF to authenticate the UE.

  B. AMF interacts with PCF to create an AM (access and mobility) policy association.

  C. AMF retrieves the UE AM (access and mobility) and SM (session management) data from UDM.

  D. AMF allocates a 5G-GUTI and includes it in the Registration Accept message sent to UE.

  Correct Answer: C

  Reference: https://www.sciencedirect.com/topics/engineering/registration-area

• Question 28:

  Which of the following statements regarding the 5G security components is FALSE?

  A. The authentication credential repository and processing function (ARPF) selects the authentication method to use for the UE.

  B. The authentication server function (AUSF) handles authentication requests for both 3GPP and non3GPP access.

  C. The security anchor function (SEAF) makes the final decision on UE authentication.

  D. The security identifier de-concealing function (SIDF) decrypts the UE's SUCI to obtain its corresponding SUPI.

  Correct Answer: D

  Reference: https://www.etsi.org/deliver/etsi_ts/133500_133599/133501/15.02.00_60/ts_133501v150200p.pdf

• Question 29:

  Which of the following statements about N2-based handover in 5GS is FALSE?

  A. Handover signaling messages are exchanged between source and target NG-RAN nodes through AMF.

  B. The serving AMF determines if it can continue to serve the UE and select a target AMF when required.

  C. The serving SMF determines if the UPF terminating N3 can continue to serve the UE and selects a target I-UPF when required.

  D. The SMF decides whether a direct or indirect downlink data forwarding path is to be used.

  Correct Answer: C

• Question 30:

  Which of the following best describes a UE route selection policy (URSP)?

  A. A URSP is a policy pre-configured in the UE. The UE uses this policy to select a non-3GPP access network and an N3IWF to use in the PLMN.

  B. A URSP is a policy provisioned to AMF by PCF. The AMF uses this policy to select an SMF that can serve a given PDU session for the UE.

  C. A URSP is a policy that can be pre-configured in the UE or provisioned to the UE by PCF. The UE uses this policy to determine how to handle a given application.

  D. A URSP is a policy pre-configured on the SMF. The SMF uses this policy to select a UPF that can serve a given PDU session for the UE.

  Correct Answer: C

  Reference: https://itectec.com/spec/6-6-ue-policy-information/