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NO.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
NO.2 Why should you configure send-flush-on failure on your PE routers when using
active/standby pseudowires?
A. It flushes the local FDB speeding recovery
B. It discards all packets in the queue and sends icmp-discad messages to the sender. The packets
are re-transmitted resulting in no loss of data.
C. On failure, the PE sends an LDP flush-all-from-me message to all PE devices in the VPLS. This
speeds convergence to the new topology.
D. It is not important to use send-flush-on-failure as Active/Standby signalling automatically
converges the FDB in all VPLS instances
Answer: C
NO.3 Which of the following is a function of the data plane that must be considered when
provisioning a VPLS service?
A. Number of LSPs.
B. Number of TLDP sessions.
C. Number of SDPs.
D. MAC address consumption in the FDB.
E. Bandwidth and replication requirements.
Answer: E
NO.4 Click on the exhibit below.
CE-A is on VLAN 200 and CE-B is on VLAN 300. Which of the following SAP ids can be configured on
PE-A and PE-B to allow direct communication between CE-A and CE-B?
A. PE-A will require a SAP id of "sap 1 /1 /1:200" and PE-B will require a SAP id of "sap 1 /1 /1:300.
B. PE-A will require a SAP id of "sap 1 /1 /1" and PE-B will require a SAP id of "sap 1 /1 /1".
C. PE-A will require a SAP id of "sap 1 /1 /1:0" and PE-B will require a SAP id of "sap 1 /1 /1:0".
D. PE-A will require a SAP id of "sap 1 /1 /1:*" and PE-B will require a SAP id of "sap 1 /1 /1:*".
Answer: A
NO.5 What is the MTU impact on the SDP path-mtu if fast reroute facilities-mode is implemented
on the LSP?
A. There will be no impact on the path-mtu.
B. The path-mtu will decrease by4 bytes.
C. The path-mtu will increase by 4 bytes.
D. The path-mtu will decrease by 8 bytes.
E. The path-mtu will increase by 8 bytes.
Answer: B
NO.6 An l-VPLS can be associated with many B-VPLS services.
A. TRUE
B. FALSE
Answer: B
NO.7 Why is MAC explosion a factor to be considered when designing a large VPLS network?
(Choose 2)
A. The time to relearn thousands of MAC addresses may result in excessive flooding or loss of
packets.
B. If the FDB reaches the limit, the router will discard frames.
C. Discarding frames when the FDB limit is reached could deny SLA guarantees.
D. It could take several seconds to relearn thousands of MAC addresses denying QoS/SLA
guarantees.
Answer: A,D
NO.8 To reduce the amount of flooding between PE devices which of the following steps
shouldbetaken?
A. Configure the local age timer to be larger.
B. Configure the local age timer to be lower.
C. Configure the remote age timer to be larger.
D. Configure the remote age to be lower.
Answer: C