Alcatel-Lucent Virtual Private LAN Services Questions + Answers

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Question 1 ( Topic 1 )
Which of the following technologies allows for two explicit VLAN tags to be received from a customer device?
A. RSVP-TE
B. SP-VLAN
C. QinQ
D. Dot1Q


Answer : C

Question 2 ( Topic 1 )
What is the SA in the Ethernet frame used for by a layer 2 switch?
A. MAC learning
B. SA filtering
C. Routing table population
D. Frame forwarding


Answer : A

Question 3 ( Topic 1 )
What are the limitations of a traditional layer 2 switch? (Choose 3}
A. Isolates collision domains.
B. Requires layer 2 loop prevention.
C. Slow response to topology changes.
D. Limited to 4094 vlans per switch.
E. Increased flooding.


Answer : B,C,D

Question 4 ( Topic 1 )
Which of the following statements about the VC-ID is false?
A. The vc-id is signaled in the control plane.
B. The vc-id is part of the data plane encapsulation.
C. There is a vc-id to vc-label mapping.
D. The vc-id has point to point significance.


Answer : B

Question 5 ( Topic 1 )
Assuming TLDP and RSVP are both being used in an MPLS network core which of the following statements is true?
A. TLDP is used to create the inner label, RSVP is used to create the outer label.
B. TLDP is used to create the outer label, RSVP is used to create the inner label.
C. TLDP and RSVP cannot be used in the same network since they both provide the same label.
D. When RSVP is used, TLDP must be disabled and static vc labels should be used.
E. TLDP and RSVP can be used to create either labels based on how they are configured.


Answer : A

Question 6 ( Topic 1 )
Fill in the blank for this next sentence. Flooded traffic received on any ____________in the service is replicated to other spoke SDPs and SAPs and not transmitted on any mesh
SDPs.
A. Spoke SDP
B. Mesh SDP
C. Either (a) or (b) will make this sentence true.
D. Neither (a) nor (b) will make this sentence true.


Answer : B

Question 7 ( Topic 1 )
Port 1/1/1 has been configured as an access port with QinQ encapsulation. Which of the following three statements are true for ingress traffic assuming default configuration?
(Choose 3)
A. sap 1/1/1:*.0 is a valid sap id.
B. sap 1/1/1:100* will accept frames with a single tag of 100.
C. sap 1/1/1:200* will strip the top tag of 200 and the bottom tag will be transparently passed.
D. sap 1/1/1:0* will accept all untagged frames.
E. sap 1/1/1:0* will accept any tagged frames.


Answer : B,C,D

Question 8 ( Topic 1 )
Which of the following statements relating to VPLS is false?
A. A VPLS is a multipoint Layer 2 service.
B. A VPLS allows multiple customer sites to be connected in a single bridged domain.
C. A VPLS on a single node requires a SDP.
D. With an IP/MPLS infrastructure, service providers can provide multiple VPLS services over a common IP/MPLS infrastructure.
E. The VPLS switches traffic based on MAC address associated to the appropriate SAP.


Answer : C

Question 9 ( Topic 1 )
Click on the exhibit below.
Assume the port on CE-A is sending two tags, a top tag of 100 and a bottom tag of 500.
PE-A is configured with a SAP id of 1/1/1:100.*. How should PE-B be configured if CE-B is expecting a top tag of 200 and a bottom tag of 500?
A. PE-B will require a SAP id of "sap 1/1/1:500*".
B. PE-B will require a SAP id of "sap 1/1/1:100*".
C. PE-B will require a SAP id of "sap 1/1/1:500.200".
D. PE-B will require a SAP id of "sap 1/1/1:200*".


Answer : D

Question 10 ( Topic 1 )
Which of the following statements is false?
A. VPLS is a bridged LAN service.
B. VPLS provides L2 VPN services to CEs.
C. VPLS is a point-to-point service where CEs are presented with point-to-point virtual circuits.
D. CEs that are members of the same VPLS service instance communicate with each other as if they are connected via a bridged LAN.


Answer : C


Question 11 ( Topic 1 )
Click on the exhibit below.
The following VPLS services and SAPs have been configured. Which of the following statements is true?
A. All untagged frames will be dropped.
B. The source MAC address of a frame with a top tag of 200 and bottom tag of 300 will be populated in VPLS 3.
C. All frames with more than one tag will be dropped.
D. The source MAC address of a frame with a single tag of 500 will be populated in VPLS 1.
E. The source MAC address of a frame with a top tag of 100 will be populated in VPLS 2.


Answer : E

Question 12 ( Topic 1 )
Click on the exhibit below.
If the SDP between R2 and R1 goes down, what devices will be reachable from R2 through the VPLS?
A. Only R4 will be reachable through the VPLS. B All devices will be reachable through the VPLS.
B. R4 and R3 will remain reachable.
C. No devices will be reachable.


Answer : A

Question 13 ( Topic 1 )
What is the default service-mtu for a VPLS service?
A. 1500
B. 1514
C. 1518
D. It depends on the access port MTU.
E. It depends on the network port MTU.


Answer : B

Question 14 ( Topic 1 )
Click on the exhibit below.
The VPLS service MTU on R2 is 1514 bytes. What must the service MTU be on all other routers participating in the VPLS?
A. The service MTU must be equal to or smaller than 1514 bytes.
B. The service MTU must be 1514 bytes.
C. The service MTU must be equal to or greater than 1514 bytes.
D. The service MTU can be any value.


Answer : B

Question 15 ( Topic 1 )
What is the default fdb size for a VPLS service?
A. 100
B. 1
C. 25
D. 250


Answer : D


Question 16 ( Topic 1 )
If the command "disable-learning" has been added at the VPLS level, then MAC entries which have already been learned will not be aged.
A. TRUE
B. FALSE


Answer : B

Question 17 ( Topic 1 )
Which OAM tool can be used to dynamically learn the MAC address of a CE device connected to a SAP within a VPLS service?
A. oam mac-populate
B. oam mac-ping
C. oam mac-trace
D. oam svc-ping
E. oam cpe-ping


Answer : E

Question 18 ( Topic 1 )
During the process of troubleshooting a VPLS problem the "oam mac-purge" command with "register" option was used to purge a MAC address from the FDB. Which of the following statements is true?
A. RelearningoftheMAC address that was purged can only be done once customer traffic resumes.
B. Relearningofthe MAC address that was purged can only be done with the "oam mac- populate" command.
C. Customer traffic destined to the MAC address that was purged will be dropped until the MAC address is relearned with the "oam mac-populate" command.
D. Relearning of the MAC address that was purged can only be done with the "oam mac- register" command.


Answer : B

Question 19 ( Topic 1 )
Click on the exhibit below.
The following IP filter has been configured and applied to a SAP in a non-VPLS service.
Which of the following statements is true?
A. An error will be generated and the configuration will not be allowed.
B. The filter entry will be ignored and traffic matching the criteria will be forwarded
C. All traffic matching entry 20 will be dropped.
D. Traffic matching entry 20 will be forwarded to sdp 100:1.


Answer : C

Question 20 ( Topic 1 )
Which of the following statements is true?
A. Filter Policies can only be applied on egress.
B. An IP filter can be applied on ingress at the same time a MAC filter is applied on the egress of the SAP.
C. Filter Policies can be based on IP, MAC, and VPI/VCI addresses.
D. Any number of ingress and egress filter policies can be associated with a SAP.
E. An IP filter and a MAC filter can be applied on the ingress SAP at the same time.
F. None of the above.


Answer : B


Question 21 ( Topic 1 )
How is the Primary Bridge chosen in a VPLS?
A. The PE devices participating in the VPLSmesh run a separate Spanning Tree instance in the Core. The Primary Bridge is the Root Bridge for the VPLS mesh.
B. The PE devices participating in the VPLS mesh determine which bridge is closest to Root Bridge. This bridge becomes the Primary Bridge.
C. The PE devices participating in the VPLS mesh determine which bridge has the lowest bridge-id. This bridge becomes the Primary Bridge.
D. The PE devices participating in the VPLS mesh determine which bridge is the Root Bridge. This becomes the Primary Bridge.


Answer : B

Question 22 ( Topic 1 )
When spanning tree is enabled within a VPLS service and the STP mode is 802.1 D 2004 what happens if a PVST BPDU is received on a SAP?
A. Spanning tree will be disabled on the SAP that the PVST BPDU was received on.
B. The SAP that the PVST BPDU was received on will be disabled to prevent loops.
C. The spanning tree encapsulation will be dynamically changed to PVST on the SAP the PVST BPDU was received on.
D. The PVST BPDU will be ignored and 802.1D 2004 BPDUs will continue to be transmitted on the SAP.


Answer : C

Question 23 ( Topic 1 )
Click on the exhibit below.
Which bridge will become the root bridge?
A. Bridge B
B. Bridge C
C. Bridge D
D. Bridge E


Answer : D

Question 24 ( Topic 1 )
Which of the following statements about Spanning Tree Protocol is true?
A. For the switches that are non-root or designated switches, the port with the highest combined cost to the root is the root port.
B. In the case where two switches have the same priority, the switch with the lowest MAC address becomes the root.
C. The switch port that is the greatest distance from the LAN to the root is the designated port.
D. All of the above.


Answer : B

Question 25 ( Topic 1 )
In Rapid Spanning Tree Protocol, a Backup Port is on the same switch as a Designated
Port?
A. TRUE
B. FALSE


Answer : A

Question 26 ( Topic 1 )
Click on the exhibit below.
Based on the output below which of the following statements is true?
A. This Bridge is furthest from the Root Bridge within the VPLS mesh.
B. This Bridge is the Root Bridge.
C. SAP 1/1/1 is an Edge Port.
D. This Bridge is closest to the Root Bridge within the VPLS mesh.


Answer : D

Question 27 ( Topic 1 )
How can one ensure that a specific switch will be select as root in an STP network?
A. Set the bridge priority to 131071.
B. Set the bridge priority to 0.
C. Set the bridge priority to 32768.
D. Leave the bridge priority as the default.


Answer : B

Question 28 ( Topic 1 )
In RSTP, an alternate port is on the same switch as a designated Port.
A. TRUE
B. FALSE


Answer : B

Question 29 ( Topic 1 )
Two management VPLSs have been created. mVPLS 1 and mVPLS 2. Two user VPLS services exist. uVPLS 10 and uVPLS 20. What command can be used to determine which management VPLS is managing uVPLS 10?
A. showstp 10
B. show service vpls 1 stp C, showserviceid 10 stp
C. show service id 1 stp or show service id 2 stp


Answer : C

Question 30 ( Topic 1 )
How do user VPLSs become associated with a management VPLS for redundant spoke- sdp connections?
A. The association must be defined in the user VPLS service.
B. The association is done when the user VPLS is associated with the same sdp-id in the management VPLS
C. The association is based on service IDs.
D. The association is based on customer IDs.


Answer : B


Question 31 ( Topic 1 )
Click on the exhibit below.
Based on the output below which of the following statements is true? (Choose 2)
A. VPLS1500isauserVPLS.
B. VPLS 1500 is management VPLS.
C. Spanning tree BPDUs for the management VPLS are tagged.
D. Spanning tree BPDUs for the management VPLS are untagged.


Answer : A,D

Question 32 ( Topic 1 )
If a management VPLS is administratively disabled what will be the status of the associated user VPLS SAPs?
A. Regular semantics will apply. It will be as if the SAP doesn't belong to a management VPLS.
B. All user VPLS SAPs will be disabled/pruned.
C. It is not possible to administratively disable a management VPLS.
D. Spanning tree will be automatically enabled on the user VPLS SAPs.


Answer : B

Question 33 ( Topic 1 )
MC-LAG is only supported on network ports.
A. TRUE
B. FALSE


Answer : B

Question 34 ( Topic 1 )
Which protocol is used to signal the status of the active links between the PE and the CE in
MC-LAG?
A. MSTP
B. MCLAG
C. LACP
D. DHCP
E. A proprietary protocol


Answer : C

Question 35 ( Topic 1 )
MC-LAG provides link and node protection from an MDU to 3 or more PE devices.
A. TRUE
B. FALSE


Answer : B