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Nokia Mobile Gateways for the LTE Evolved Packet Core Questions and Answers

Question 1

Based on the information shown in the exhibit, and assuming this is the only bearer present, what is the action taken by the SGW when:

- The SGW receives a GTP packet over its S5 interface, and

- The TEID value in the GTP header is set to 0x802d25?

Options:

A.

The packet is forwarded to the eNodeB

B.

The packet is buffered.

C.

The packet is dropped.

D.

The packet is forwarded to the MME.

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Question 2

Which of the following statements most accurately describes the EPS bearers?

Options:

A.

A UE can have only one default bearer.

B.

A UE may have more than one dedicated bearer.

C.

Each EPS bearer may provide different QoS treatment for its traffic.

D.

EPS bearers that connect a given UE to a single APN use different IP subnets.

E.

Only answers A, B and C are correct.

F.

Only answers B and C are correct.

Question 3

Which of the following most accurately describes the messages used to manage a Diameter connection path?

Options:

A.

The Capabilities-Exchange message

B.

The Device-Watchdog message

C.

The Credit-Control message

D.

The Disconnect-Peer message

E.

All of the above answers are correct

F.

Only answers A, B and D are correct

Question 4

Based on the information shown in the exhibit, what type of handover is performed when the UE moves from eNodeB2 to eNodeB4?

Options:

A.

X2-based handover without SGW relocation

B.

X2-based handover with SGW relocation

C.

X2-based handover with MME relocation

D.

S1-based handover with SGW relocation

E.

S1-based handover with MME relocation

Question 5

Which of the following statements is FALSE regarding the UE paging process?

Options:

A.

The SGW performs downlink data buffering while the S1 bearer is being established.

B.

The SGW initiates the paging messages towards the UE.

C.

The PGW is not aware of the paging process.

D.

The UE initiates the service request procedure once it receives the paging message.

E.

The paging procedure is controlled by the MME.

Question 6

Which entity decides when a handover procedure needs to be performed?

Options:

A.

The UE.

B.

The source eNodeB.

C.

The target eNodeB.

D.

The MME.

E.

The SGW.

Question 7

Which of the following are Diameter-based interfaces?

Options:

A.

The RF and the S10 interfaces.

B.

The RF and the Gx interfaces.

C.

The Rx and the S4 interfaces.

D.

The Rx and the SGi interfaces.

E.

The S9 and the S11 interfaces.

Question 8

Assume that dynamic PCC rules are used on the PGW. When an AF server initiates the establishment of a dedicated bearer for a UE, which of the following messages are exchanged between the PCRF and the PCEF?

Options:

A.

The RAR/RAA messages

B.

The CSR/CSResp messages

C.

The CCR/CCA messages.

D.

The CSR/CSResp and the CCR/CCA messages

E.

The CSR/CSResp and the RAR/RAA messages.

Question 9

A dedicated bearer 6 has a total of six SDF filters. Based on the information shown in the exhibit, which of the following is the right order to apply the filters to the uplink traffic?

Options:

A.

The filters: 0 (first), 1, 2, 3, 4, 5 (last).

B.

The filters: 2 (first), 3, 0, 1, 4, 5 (last).

C.

The filters: 1 (first), 3, 5 (last).

D.

The filters: 2 (first), 4, 0 (last).

E.

The filters: 3 (first), 5, 1 (last).

F.

The filters: 1 (first), 5, 3 (last).

Question 10

On an Nokia 7750 PGW, which of the following is a mandatory step required to set up a Diameter connection to a PCRF server?

Options:

A.

Create a Diameter profile.

B.

Create a Diameter Peer profile.

C.

Assign the Diameter profile to the Diameter Peer profile

D.

Assign the Diameter Peer profile to the Gx interface.

E.

All of the above answers are required.

F.

Only answers B and D are required.

Question 11

The S5 is the interface used for the communication between the SGW and the PGW. Which of the following transport protocols is used by this interface?

Options:

A.

GTP/TCP

B.

GTP/UDP

C.

GTP/IP

D.

GTP/SCTP

E.

None of the above answers are correct

Question 12

Which of the following interfaces is not using the GTP-U protocol?

Options:

A.

The X2 interface

B.

The S1-U interface

C.

The S4 interface

D.

The S5 interface

E.

The SGi interface

Question 13

Which of the following interfaces is not using the GTP-C protocol?

Options:

A.

TheS11 interface

B.

The S1-MME interface

C.

The S10 interface

D.

The S5 interface

E.

The S8 interface

Question 14

In a 3G network, which of the following statements most accurately describes the user data plane between a UE and the GGSN when a direct tunnel is not used?

Options:

A.

A Radio Access Bearer between the UE and the NodeB, a GTP tunnel between the NodeB and the SGSN, and another GTP tunnel between the SGSN and the GGSN.

B.

A Radio Access Bearer between the UE and the SGSN and a GTP tunnel between the SGSN and the GGSN.

C.

A GTP tunnel between the UE and the GGSN.

D.

A Radio Access Bearer between the UE and the RNC, a GTP tunnel between the RNC and the SGSN, and another GTP tunnel between the SGSN and the GGSN.

E.

None of the above answers are correct.

Question 15

On Nokia 7750 PGW, which of the following CLI commands can be used to debug a given IMSI?

Options:

A.

debug mobile-gateway pdn 1 pdn-session imsi 226041000000008

B.

debug mobile-gateway pdn 1 pdn-session-db imsi 226041000000008

C.

debug mobile-gateway pdn 1 pdn-session imsi 226041000000008 apn ipd.Nokia.com

D.

debug mobile-gateway pdn 1 pdn-session-db imsi 226041000000008 apn ipd.Nokia.com

E.

Answers A and C are both correct.

F.

Answers B and D are both correct.

Question 16

Based on the information shown in the exhibit, which of the following is the time interval used by the SGW to send out an "Echo Request" message over the GTP interface?

Options:

A.

3 seconds

B.

5 seconds

C.

6 seconds

D.

60 seconds

E.

90 seconds

Question 17

On Nokia 7750 SGW, which of the following CLI commands can be used to check the number of times a handover procedure has been performed for a particular UE?

Options:

A.

Show mobile-gateway serving call-flow-stats

B.

Show mobile-gateway serving pdn-context imsi detail

C.

Show mobile-gateway serving ue-context imsi detail

D.

Show mobile-gateway serving bearer-context imsi detail

E.

Show mobile-gateway serving ref-point-stats s11

Question 18

On Nokia 7750 SGW, which of the following statements is FALSE regarding the debugging of a given IMSI?

Options:

A.

The debugging allows the operator to analyze information and messages related to a given IMSI in real-time.

B.

The APN value must be specified in the debug command.

C.

The output may be filtered per APN or per reference point.

D.

The debugging supports three levels of tracing detail.

E.

None of the above statements are false.

Question 19

On the Nokia 7750 PGW, which of the following CLI commands is used to check the message statistics between the PGW and the PCRF?

Options:

A.

Show mobile-gateway pdn pdn-context

B.

Show mobile-gateway pdn ref-point-stats ga

C.

Show mobile-gateway pdn ref-point-stats gx

D.

Show mobile-gateway pdn ref-point-peers gn

E.

Show mobile-gateway pdn ref-point-peers gx

Question 20

Which of the following is the message used to detect a transport failure over a Diameter connection?

Options:

A.

The Capabilities-Exchange message

B.

The Device-Watchdog message

C.

The Credit-Control message

D.

The Disconnect-Peer message

E.

None of the above answers are correct

Question 21

Based on the information shown in the exhibit, when the SGW sends an uplink user IP packet to the PGW, which of the following is the GTP TEID value expected in the GTP packet header?

Options:

A.

0xd05425

B.

0x4f00805

C.

0x21

D.

0x4f00825

E.

None of the above answers are correct

Exam Detail
Vendor: Nokia
Certification: Nokia Other Certification
Exam Code: 4A0-M02
Exam Name: Nokia Mobile Gateways for the LTE Evolved Packet Core
Last Update: Apr 4, 2025
4A0-M02 Question Answers
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Total 140 questions
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