Alcatel-Lucent IP/MPLS Mobile Backhaul Transport Questions + Answers

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Question 1
When researching carrier-class Ethernet standards to support the mobile backhaul
Ethernet transport, which standards body would you consult?
A. IEEE
B. MEF
C. ITU-T
D. NGMN


Answer : B

Question 2
The IETF is know for which standardization effort?
A. It develops recommendations for core network functionality, broadband service delivery and next generation services
B. It maintains Requests for Comment (RFC) that describe technical solutions to Internet challenges
C. It creates single, integrated network design guidelines to support mobile broadband services
D. It develops radio access services and systems for high capacity mobile networks


Answer : B

Question 3
Click on the exhibit.
Given the following:
On the OC-3 port, each provisioned channel group contains all available timeslots.
The command result illustrates which circuit status?
A. The E1 channel group is administratively turned down
B. The DS1 circuit physical link is operationally down
C. The IMA bundle has no operational member links
D. The associated Layer 3 interface is operationallydown


Answer : B

Question 4
In the Alcatel-Lucent SROS, which command creates the OC-3 path's Administrative Unit
(AU)-4 Virtual Container (VC) capacity?
A. configure port 3/1/2 sonet-sdh path au-4
B. configure port 3/1/2 sonet-sdh path sts3
C. configure port 3/1/2 sonet-sdh path tug-3
D. configure port 3/1/2 sonet-sdh path vc-4


Answer : B

Question 5
Click on the exhibit.
On the OC-3 port, each provisioned channel group contains all available timeslots
The command result illustrates which OC-3 port characteristic?
A. On STS1-1,the second VT1.5 in the second VTG is set for IPCP encapsulation
B. On STS1-1,the second DS1 channel group in the second VTG isoperationallyup
C. On STS1-1, the second E1 channel group in the second TUG-2 is operationally up
D. On STS1-1, the second VT2 in the second TUG-2 is set for IPCP encapsulation


Answer : C


Question 6
Which statement correctly describes the Point-to-Point (PPP) Multilink Protocol (MP) negotiation process?
A. At least one link must complete Link Control Protocol (LCP) negotiations before the bundle can initialize
B. The endpoints indicate their desire to implement MP in the link Network Control Protocol (NCP) phase
C. The bundle must complete LCP negotiations before it can enter the NCP negotiation phase
D. Internet Protocol-Control Protocol (IPCP) negotiations must succeed for the bundle links to initialize


Answer : A

Question 7
In the Alcatel-Lucent SROS, which payload type set in a SDH-framed OC-12 port creates individual E1 containers?
A. Virtual Tributary (VT) 1.5
B. VT2
C. Virtual Container (VC)-11
D. VC-12


Answer : B

Question 8
Click on the exhibit.
The command result indicates which condition on the Inverse Multiplexing over ATM (IMA) bundle?
A. The number of active links has dropped belowthe minimum threshold
B. The associated Layer 3 interface is administratively down
C. The remote IMA bundle is administrativelydown
D. The parent OC-3 is operationally down


Answer : C

Question 9
Which timing technique can deliver time of day and phase synchronization information to the base station without concern for Packet Delay Variation (PDV)?
A. Building Integrated Timing Supply (BITS)
B. Global Positioning System (GPS)
C. Adaptive Clock Recovery (ACR)
D. IEEE 1588v2/Precision Time Protocol (PTP)


Answer : B

Question 10
Which messages, periodically sent between an IEEE 1588v2/Precision Time Protocol
(PTP) v2 master and slave, serve as hellos to help the slave choose the best available master?
A. Announce
B. Announce_grant
C. Sync
D. Delay_response


Answer : A


Question 11
Click on the exhibit.
Consider the topology and MLS1 configuration shown, and given the following conditions:
MLS1 delivers the PRC traceable clock to the network
Reference 1 receives Quality Level (QL) - ST3
Reference 2 receives QL - DUS
BITS sets QL-STU
Which quality level will MLS1 deliver to POC2-1 on its Synchronous Ethernet (SyncE) port
1/2/7?
A. QL-EEC2
B. QL-PRS
C. QL-ST3
D. QL-STU


Answer : C

Question 12
Click on the exhibit.
Given the show command results shown:
With what IEEE 1588v2/Precision Time Protocol (PTP) v2 message did the slave node set the Unicast message rates used by the master?
A. Announce granted
B. Announce request
C. Sync granted
D. Sync request


Answer : B

Question 13
Which statement best describes adaptive timing techniques?
A. Adaptive timing calculates the time of day from time stamped packets
B. Adaptive timing calculates the time of day from the arriving packet rate
C. Adaptive timing only supports frequency synchronization
D. Adaptive timing only operates on point-to-point links


Answer : A

Question 14
If an IEEE 1588v2/Precision Time Protocol (PTP) v2 slave times out announce messages with the master, to which state does the slave port transition to choose another potential master?
A. Initial
B. Listening
C. Passive
D. Un-calibrated


Answer : B

Question 15
Click on the exhibit.
Given the configuration shown and the following conditions:
* The external reference is offline
* Reference 1 receives Quality Level (QL) - EEC1
* Reference 2 receives QL - SSU-A
Which quality level will the SAR router advertise to its Synchronous Ethernet (SyncE) peers?
A. QL-DNU
B. QL-EEC1
C. QL-SSU-A
D. QL-PRC
E. QL-UNC


Answer : B


Question 16
Click on the exhibit.
Given the show command results shown:
Which IEEE 1588v2/Precision Time Protocol (PTP) v2 parent clock value does the slave first consider when choosing its master?
A. GM Clock Priority1
B. GM Clock ID
C. GM Clock Priority2
D. GM Clock Class


Answer : D

Question 17
An SROS router obtains its timing exclusively from its BITS input port. The router sets
Quality Level (QL) SONET Traceability Unknown (STU) on this Superframe (SF) framed
DS1 BITS reference.
What must you configure on this master router to pass the best clock quality level to the downstream Synchronous Ethernet (SyncE) slave nodes while maintaining traceability to the DS1 source?
A. Enable "ql-override prs" on the BITS reference
B. Enable "ql-override prs" on the master's SyncE ports
C. Enable "ql-selection prs" on the BITS reference
D. Set the master router to choose its source by quality level


Answer : A

Question 18
Click on the exhibit.
Consider the topology and MLS1 configuration shown, and given the following conditions:
* MLS1 delivers the PRC traceable clock to the network
* Reference 1 receives Quality Level (QL) - EEC1
* Reference 2 receives QL - SSU-A
* BITS sets QL-SSU-B
Which quality level will MLS1 deliver to POC2-1 on its Synchronous Ethernet (SyncE) port
1/2/7?
A. QL-EEC1
B. QL-PRC
C. QL-SSU-A
D. QL-STU


Answer : B

Question 19
Which synchronization technique supports time of day and phase synchronization?
A. IEEE 1588 v2/Precision Time Protocol (PTP)v2
B. Adaptive Clock Recovery (ACR)
C. Time Division Multiplexing (TDM) line timing
D. Synchronization Ethernet (SyncE)/Synchronization Status Message (SSM)


Answer : A

Question 20
Which is a characteristic of the IEEE 802.3 Slow Protocol?
A. There are a maximum of 10 frames transmitted per second
B. There are a maximum of 20 slow protocol subtypes per interface
C. The maximum slow protocol frame size is 64 bytes
D. The slow protocol header carries the clock quality level


Answer : A


Question 21
Which statement best describes phase synchronization as it is used in the backhaul transport?
A. The master and slave clocks cycle at a rate within 50 parts per billion (ppb)
B. The master and slave clockframes start within +/- 500 nanoseconds
C. The slave clock sets its clock frequency to the incoming bit rate
D. The slave sets its time and date accordingly to the arriving packet rate


Answer : B

Question 22
Which command example correctly configures a 7750 Service Router (SR) for
Synchronous Ethernet (SyncE) support?
A. configure card 1 mda 1 sync-e
B. configure card 1 ethernet sync-e
C. configure system sync-if-timing sync-e no shutdown
D. configure port 1/1/1 ethernet sync-e no shutdown


Answer : A

Question 23
Which component must you configure on an IEEE 1588v2/Precision Time Protocol (PTP) v2 slave to enable it to choose its master based on Synchronization Status Message (SSM)
Option 1 or Option 2 Quality Levels?
A. Setthe PTP porttothe desired ITU-T G.781 Option 1 or2 mode
B. Setthe SROS IEEE 1588v2 profile to IEEE 1588-2008
C. Set the SROS IEEE 1588v2 profile to ITU-T G.8265.1
D. Configure ql-override on the PTP reference entry


Answer : C

Question 24
Click on the exhibit.
Consider the topology and MLS1 configuration shown, and given the following conditions:
MLS1 delivers the PRC traceable clock to the network
Reference 1 receives Quality Level (QL) - PRS
Reference 2 receives QL - DUS
BITS sets QL-STU
Which quality level will MLS1 deliver to POC2-1 on its Synchronous Ethernet (SyncE) port
1/2/7?
A. QL-DUS
B. QL-EEC2
C. QL-PRS
D. QL-STU


Answer : C

Question 25
Click on the exhibit.
Based on the default SROS Border Gateway Protocol (BGP) timer settings and the configuration shown:
If the Interior Gateway Protocol (IGP) removes its route to the BGP neighbor 192.0.2.2, how long will BGP wait to drop its peering session with that neighbor router?
A. 0 seconds
B. 30 seconds
C. 90 seconds
D. 170 seconds


Answer : C


Question 26
Click on the exhibit.



Given the topology shown:
With Border Gateway Protocol (BGP) peer tracking enabled, what will router MLS1 do if the
Interior Gateway Protocol (IGP) removes the route to its BGP peer MLS2 system ID?
A. Itwill lookforan alternate route reflection peer
B. It will shut down BGP route reflection
C. It will set its peering session state to connect
D. It will try to peer with one of the POC3 routers


Answer : C

Question 27
Click on the exhibit.
Given the topology and the Multiprotocol Label Switching (MPLS) Label Switch Path (LSP) and path configurations shown:
You wish to protect the LSP POC3-1_POC3-2 with a manual bypass tunnel. Which statement correctly describes the manual bypass tunnel configuration requirement for the ring topology shown?
A. All nodes must have manual bypass enabled in the MPLS context
B. All nodes must have fast reroute facility enabled in the MPLS context.
C. The bypass tunnel first hop must avoid the protected LSP's tail end router
D. Each node must have a bypass-only tunnel configured to terminate on POC3-2


Answer : C

Question 28
Click on the exhibit.
Which field in the show command result indicates that the router MLS1 is configured as a
Border Gateway Protocol (BGP) route reflector?
A. Peer Type;
B. Group:
C. Peer AS:
D. Cluster Id:


Answer : D

Question 29
Click on the exhibit.
With the information given, why is the second static route to prefix 192.0.2.2/32 inactive?
A. The second route is a black hole static route
B. The static route is missing a next hop entry
C. A route with a better preference is active
D. The next hop interface is unreachable


Answer : C

Question 30
Click on the exhibit.



You wish to configure a secondary static route on MLS1 targeting the CSA1 system interface. The route must forward packets over the secondary route path as shown in the diagram. Given the following:
BFD must be enabled on the preferred route
BFD is configured on the interfaces
The MLS1 router must choose the preferred route in normal operations
Which command example correctly configures the secondary static route on MLS1?
A. configure router static-route 192 0.2.2/32 next-hop 192.0.2.6 bfd-enable
B. configure router static-route 192.0.2.6/32 next-hop 192.0.2.22 bfd-enable
C. configure router static-route 192.0.2.2/32 next-hop 192.0.2.14 precedence 10
D. configure router static-route 192.0.2.2/32 next-hop 192.0.2.22 precedence 10


Answer : D


Question 1
Which of the following statements is FALSE regarding the eNodeB?
A. The eNodeBs maybeinterconnectTEIDwith each other via anX2 interface.
B. The eNodeB is an element of the EPC core.
C. The eNodeBs areconnectedto the EPC core via the S1 interface.
D. During an IMSI attach, the eNodeB selects an MME to service the UE.
E. The eNodeB performs the compression and encryption of the user data stream.


Answer : B

Question 2
Which of the following statements most accurately describes the MME?
A. The MME selects the SGW and the PGW for a given UE.
B. The MME is responsible for the bearer management.
C. The MME communicates with both the E-UTRAN and the EPC via GTP-C tunnels.
D. The MME performs the user authentication and authorization using the information provided by the HSS
E. All of the above answers are correct.
F. Only answers A, B and D are correct.


Answer : F

Question 3
A UE needs to get an IP address before it can communicate to any PDN over the LTE network. Which of the following statements are FALSE regarding the process of the IP address allocation? (Choose two)
A. A PGW may obtain an IP address from a RADIUS server and assign it to the UE.
B. A PGW may assign the IP address from its local address pools.
C. An SGW may obtain a static IP address from the HSS server and assign it to the UE.
D. An SGW may obtain an IP address from a RADIUS server and assign it to the UE.
E. A PGW may obtain an IP address from a DHCP server and assign it to the UE.


Answer : C,D

Question 4
Which of the following statements is TRUE regarding the IP connectivity between a UE and a PDN?
A. A UE gets an IPv4 address and/or an IPv6 prefix per APN.
B. A PGW forwards the UE's IP packets to the PDN based on the address of the PDN server.
C. When a UE sends an IP packet to a PDN over the EPC core, the eNodeB forwards theencapsulatedpacket to the SGW by looking into its IP routing table to determine how to reach the PDN server.
D. The SGW forwards the UE's IP packets to the PGW based on the address of the PDN server.
E. Only answers C and D are correct.
F. Only answers A and B are correct.


Answer : F

Question 5
In a 3G network, which of the following is used to build a PDP context between a UE and the GGSN when a direct tunnel is not used?
A. An end-to-end GTP tunnel between the UE and the GGSN.
B. A Radio Access Bearer between the UE and the NodeB and a GTP tunnel between the NodeB and the GGSN.
C. A Radio Access Bearer between the UE and the SGSN and a GTP tunnel between the SGSN and the GGSN.
D. A Radio Access Bearer between the UE and the SGSN.
E. None of the above answers are correct.


Answer : C


Question 6
Which of the following statements is FALSE regarding the EPS bearers?
A. The default bearer isinitiatedby either the UE or the PCRF.
B. The default bearer is always the first bearer established to an APN.
C. An AF server may initiate adedicatedbearer to a UE.
D. EPS bearers that connect a given UE to a single PGW may use different IP subnets.
E. The default bearer remains active throughout the lifetime of the APN connection.


Answer : A

Question 7
Which of the following LTE interfaces are used for the communication of user data?
(Choose one best answer)
A. The S1-MME interface and the S11 interface.
B. The S1-U interface.
C. The S5 interface.
D. The S1-U interface, the S5 interface and the LTE-Uu interface.
E. Only answers A, B and C are correct.
F. Only answers B and C are correct.


Answer : D

Question 8
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?
A. GTP/TCP
B. GTP/UDP
C. GTP/IP
D. GTP/SCTP
E. None of the above answers are correct


Answer : B

Question 9
Based on the information shown in the exhibit, which of the following is the PLMN ID?
A. 302
B. 720
C. 123456789
D. 9876543
E. 30201613
F. 302720


Answer : F

Question 10
Which of the following statements is FALSE regarding the Tracking Area (TA)?
A. A TA is a set of eNodeBs that are defined by a UE itself.
B. A TA is the smallest geographical area in which a UE can roam without performing a Tracking Area Update (TAU) other than periodic TAU as required.
C. A Tracking Area Identity (TAI) is used to identify each tracking area.
D. The Tracking Area Identity (TAI) is assigned by the service provider.
E. One TA may be served by one or more than one MME.


Answer : A


Question 11
Which of the following statements is FALSE regarding the UE network attachment procedure?
A. The UE is served by an eNodeB.
B. The eNodeB selects one MME to serve the UE.
C. The MME selects one SGW to serve the UE.
D. The SGW selects one PGW to serve the UE
E. The PGW selects one PCRF server if required.


Answer : D

Question 12
Which of the following statements is FALSE regarding the UE paging process?
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.


Answer : B

Question 13
Based on the information shown in the exhibit, when the SGW receives an IP packet from the UE, which of the following is the GTP TEID value expected to be received in the GTP packet header?
A. 0xd05025
B. 0x4b00805
C. 0x21
D. 0x4b00825
E. None of the above answers are correct.


Answer : D

Question 14
Which of the following interfaces is not using the GTP-C protocol?
A. The X2 interface.
B. The S1-U interface.
C. The S4 interface.
D. The S5 interface.
E. The SGi interface.


Answer : E

Question 15
Which of the following most accurately identifies a GTP tunnel on the Alcatel-Lucent 7750
MG by default?
A. ATEID
B. The System IP address
C. A UDP port number
D. ATEIDand the System IP address
E. ATEID, the System IP address and a UDP port number


Answer : E

Question 16
There is an active GTP path between an Alcatel-Lucent SGW and an Alcatel-Lucent PGW,
On the SGW. Which of the following CLI commands is used to check the "Restart Count" value of the PGW?
A. show mobile-gateway serving ref-point-peers s5
B. show mobile-gateway serving ref-point-stats s5
C. show mobile-gateway serving bearer-stats s5
D. show mobile-gateway serving path-mgmt-stats s5
E. None of the above answers are correct.


Answer : D

Question 17
An Alcatel-Lucent SGW is only connected to an Alcatel-Lucent PGW. Based on the information shown in the exhibit, how many GTP-C tunnels are established between the
SGW and the PGW?
A. 1
B. 2
C. 3
D. 4
E. 6


Answer : E

Question 18
Which of the following statements most accurately describes the Diameter protocol?
A. The Diameter is a peer-to-peer protocol that uses the TCP or SCTP as the transport protocol.
B. A Diameter peer could act as a Diameter client or a Diameter server to its remote peer.
C. The Alcatel-Lucent 7750 PGW acts as a Diameter client to the PCRF server via the Gx interface.
D. The Diameter protocol uses TCP and SCTP port number 3868.
E. All of the above answers are correct.
F. Only answers A and B are correct.


Answer : E

Question 19
Which of the following most accurately describes the messages used to manage a
Diameter connection path?
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 20
Which of the following statements is FALSE regarding the S1-MME interface?
A. It is the control plane interface between the E-UTRAN and the MME.
B. It is used to signal the TEIDs for the S1 bearers between the eNodeB and the SGW.
C. The eNodeB receives the Paging messages over the S1-MME interface.
D. It is used for the management of the Radio Access Bearers.
E. It is based on the IP/UDP protocols.


Answer : E


Question 21
Which of the following statements is TRUE when the Alcatel-Lucent 7750 MG receives a
GTP packet that has a zero TEID?
A. The ingress IOM forwards the packet directly to the MG-ISM module for further processing.
B. The ingress IOM drops the packet.
C. The ingress IOM forwards the packet to the CPM for further processing.
D. The Alcatel-Lucent 7750 MG forwards the packet to its IP destination by looking into the local IP routing table.
E. None of the above answers are correct.


Answer : C

Question 22
Which of the following statements is FALSE regarding the MG-ISM module on an Alcatel-
Lucent 7750 MG?
A. The MG-ISM module implements the PCC rules for the EPS bearers.
B. The MG-ISM module can be configured as a SGW/SGSN or a PGW/GGSN.
C. The MG-ISM module enforces the QoS rules for the EPS bearers.
D. On an Alcatel-Lucent 7750 MG, two MG-ISM modules can be configured as 1+1 redundant.
E. The switchover from the active MG-ISM card to the standby MG-ISM card has no impact on other EPC nodes


Answer : B

Question 23
Based on the information shown in the exhibit, when the SGW sends a downlink user data packet to the UE, which of the following is the source IP address expected in the IP packet?
A. 10.10.2.1
B. 10.10.7.1
C. 20.20.0.1
D. 72.22.24.163
E. None of the above answers are correct


Answer : D

Question 24
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?
A. 3 seconds
B. 5 seconds
C. 6 seconds
D. 60 seconds
E. 90 seconds


Answer : D

Question 25
On an Alcatel-Lucent 7750 PGW, which of the following is the CLI context where you can specify the IP address and port number of a PCRF server?
A. Under the Diameter profile context.
B. Under the Diameter Peer profile context.
C. Under the Gx interface context.
D. Under the APN context.
E. None of the above answers are correct.


Answer : B

Question 26
Based on the information shown in the exhibit, which of the following is TRUE when the
PGW receives a "Create Session Request" with the "PDNTYPE" set to IPv4?
A. The PGW tries to allocate an IP address from the subnet "5.5.0.0/16" and assigns it to the UE.
B. The PGW tries to allocate an IP address from the subnet "3FFE::/48" and assigns it to the UE.
C. The "Create Session Request" isrejectedby the PGW.
D. There is insufficient information to answer this question.


Answer : C

Question 27
Based on the information shown in the exhibit, which of the following is TRUE when the
PGW receives a "Create Session Request" with the "APN Restriction" set to "Private2"?
Assume everything else is in working condition.
A. The "Create Session Request" isrejectedby the PGW and no bearer iscreated.
B. The "Create Session Request" isacceptedby the PGW and the bearer iscreatedsuccessfully.
C. The APN cannot be configured with an "APN Restriction" value of "any".
D. The "Create Session Request" cannot have an "APN Restriction" value of "Private2.
E. None of the above answers are correct.


Answer : B

Question 28
On the Alcatel-Lucent 7750 PGW, which of the following is the default setting of the APN
"selection-mode"?
A. ms-provided-apn
B. network-provided-apn
C. subscribed-apn
D. virtual-apn
E. None of the above answers are correct


Answer : C

Question 29
Which of the following messages are exchanged between the MME and the SGW during the UE attachment procedure? (Choose two)
A. Create Session Request / Create Session Response
B. Credit Control Request / Credit Control Answer
C. Attach Request/Attach Accept
D. Update Bearer Request / Update Bearer Response
E. Modify Bearer Request / Modify Bearer Response


Answer : A,E

Question 30
During the establishment of a default bearer, which of the following statements are TRUE regarding the TEID-U assigned by the eNodeB to the S1-U tunnel? (Choose two)
A. The eNodeB includes this TEID-U value in the Create Session Request message sent to the SGW over the S1 interface.
B. The eNodeB includes this TEID-U value in the Attach Request message sent to the MME over the S1-MME interface.
C. The MME includes this TEID-U value in the Create Session Request message sent to the SGW over the S11 interface.
D. The MME includes this TEID-U value in the Modify Bearer Request message sent to the SGW over the S11 interface.
E. The eNodeB includes this TEID-U value in the Attach Complete message sent to the MME over the S1-MME interface.
F. The eNodeB includes this TEID-U value in the Modify Bearer Request message sent to the SGW over the S1 interface.


Answer : D,E