Deck 5: Nokia Virtual Private LAN Services

Question 1

Which of the following is NOT performed by the MME during S1-based handover procedure?

A) MME determines if SGW relocation is required.
B) MME selects the target eNodeB for handover.
C) MME releases bearers that are not accepted by the target eNodeB.
D) MME checks if the handover is to restricted area based on the handover restriction list.

Answer 1

MME releases bearers that are not accepted by the target eNodeB.

Question 2

What network component(s) is/are shared in the gateway core network (GWCN) sharing architecture model?

A) Only E-UTRAN is shared
B) Only MME is shared
C) E-UTRAN and MME are shared
D) MME and PGW are shared

Answer 2

Only MME is shared

Question 3

Which logical interface is used to transfer UE information from one MME to another MME during relocation?

A) S10
B) S3
C) S6a
D) S13

Answer 3

S10

Question 4

Given the exhibit, if GTP-C load control is used, which SGW will have the highest probability of being selected by the MME for new session requests?

A) sgw01
B) sgw02
C) sgw03
D) sgw04

Question 5

Which of the following statements regarding the SMC procedure is FALSE?

A) SMC procedure must be completed successfully before AKA procedure starts.
B) MME sends a security mode command message to the UE.
C) UE responds with a security mode complete message.
D) SMC procedure is used to provide NAS signaling security between the UE and the MME.

Question 6

Which of the following statements best defines S-TMSI?

A) A permanent, unique identification of a mobile subscriber in the GSM/UMTS/EPS system.
B) A network that provides mobile communication services to the public.
C) A globally unique temporary mobile identifier used to hide the subscriber's real permanent identity.
D) An identifier assigned by the MME that uniquely identifies a UE within an MME pool.

Question 7

Which of the following statements regarding the role of the MME in the packet core is FALSE?

A) MME manages registration, authentication, and mobility for the UE.
B) MME handles setup and management of UE connections to data and voice over LTE.
C) MME routes and forwards user data packets received from eNodeB.
D) MME selects the appropriate SGW and PGW during a UE relocation.

Question 8

Which of the following is NOT a characteristic of the home routed roaming architecture?

A) Bearer traffic is routed from the SGW to the PGW over the S5 interface
B) The UE bearers are anchored at the SGW to the VPLMN
C) Subscriber services are obtained through the HPLMN
D) The MME in the VPLMN has an S6a interface to the HSS in the HPLMN

Question 9

Which of the following is NOT performed by the MME during a TAU procedure?

A) MME sends paging messages to a list of eNodeBs.
B) MME informs the HSS about the UE's current location.
C) MME sends the UE a new TA list containing the new TAIs.
D) MME determines if SGW relocation is required and selects a new SGW.

Question 10

Which of the following statements regarding SGW selection by the MME is FALSE?

A) SGW selection can occur during initial attach, tracking area update, or handover procedures
B) MME can select an SGW by performing a DNS query on a given TAI FQDN
C) MME can select an SGW based on the overload control information received from each SGW in the SGW pool
D) MME can select an SGW from the SGW pool(s) configured to serve the given TAI

Question 11

Which of the following is NOT a benefit of S1-Flex mechanism?

A) Minimizes MME relocation in case of UE mobility
B) Minimizes the number of MMEs required in a network
C) Provides MME load balancing
D) Provides MME geographical resilience

Question 12

Which of the following statements regarding handover is FALSE?

A) Handover can occur when UE is in ECM-CONNECTED state
B) S1-based handover is used when X2-based handover attempt failed
C) During X2-based handover, MME may remain the same or be relocated
D) S1-based handover is used when there is no X2 interface between source and target eNodeBs

Question 13

If the selected SGW fails, which SGW/PGW will MME select if 'gateway selection mode 2' is used?

A) A new SGW, but new PGW selection is not required
B) A new SGW first, then select a new PGW that is topologically closest to the newly selected SGW
C) A new SGW first, then select a new PGW with the best order and preference values
D) The next topologically closest SGW/PGW pair

Question 14

Which of the following functions is NOT performed by MME when it receives a TAU from a UE?

A) Perform message integrity check
B) Inform HSS of the UE's current location
C) Check if UE requests access to a restricted tracking area
D) Send paging message to a list of SGWs belonging to UE's registered tracking area

Question 15

Which of the following MME interfaces uses a protocol OTHER than GTP-C or Diameter?

A) S1-MME
B) S11
C) S6a
D) SLg