Alcatel-Lucent Virtual Private LAN Services (4A0-105) - Alcatel-Lucent Actual Exam Questions
Last updated on April 11, 2026
Why is MAC explosion a factor to be considered when designing a large VPLS network? (Choose 2)
The time to relearn thousands of MAC addresses may result in excessive flooding or loss of packets.
If the FDB reaches the limit, the router will discard frames.
Discarding frames when the FDB limit is reached could deny SLA guarantees.
It could take several seconds to relearn thousands of MAC addresses denying QoS/SLA guarantees.
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What needs to be configured in a VPLS in order to forward customer STP BPDUs transparently?
Spanning tree must be enabled within the VPLS.
Spanning tree BPDUs must be untagged.
Spanning tree BPDUs must be tagged.
Spanning tree must be disabled within the VPLS.
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IEEE 802.3ah frames must be untagged.
TRUE
FALSE
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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?
PE-B will require a SAP id of "sap 1/1/1:500*".
PE-B will require a SAP id of "sap 1/1/1:100*".
PE-B will require a SAP id of "sap 1/1/1:500.200".
PE-B will require a SAP id of "sap 1/1/1:200*".
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Click on the exhibit below. Assume there are two VPLS services configured on the MDU. How could load-balancing be achieved when using Active/Standby pseudowires?
This cannot be done.
Each VPLS will use the same pair of SDP's with the same endpoint configured with the option "load-balancing 2".
Each VPLS will need their own pair of spoke-SDP's configured. The spoke-sdp's that are to be active should be configured with the option "precedence primary".
Under the end-point configuration, enable load-balancing 2 and the MDU will load balance automatically.
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