4A0-105 Online Practice Questions and Answers

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.

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?

A. This cannot be done.

B. Each VPLS will use the same pair of SDP's with the same endpoint configured with the option "loadbalancing 2".

C. 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".

D. Under the end-point configuration, enable load-balancing 2 and the MDU will load balance automatically.

What is the DA address used for in the Ethernet Header?

A. MAC learning

B. SA filtering

C. Routing table population

D. Frame forwarding

How many designated ports are there in a spanning tree topology?

A. The same as the number of alternate ports in the topology

B. 1 per segment

C. The same as the number of root ports

D. 1 per switch

You are providing a customer two VPLS services in two different Metro networks. VPLS 500 has been configured in Metro 1 and VPLS 900 has been configured in Metro 2. The customer has requested that they have connectivity between the Metro Networks with their existing VPLS services. Which configuration on the PE routers linking the metro networks will allow for VPLS 500 and VPLS 900 to act as a single VPLS service? Assume default values for all VPLS parameters and SDP 999 exists between the metro networks.

A.

B. C. D.

Which of the following describes the overhead added to a customer frame on an Ethernet link in a VPLS service on the Alcatel-Lucent 7750 SR?

A. The overhead consists of 26 bytes. 14 DLC + 2 Ethertype + 8 for mpls labels + 2 for GRE

B. The overhead consists of 14 bytes for DLC.

C. The overhead consists of 18 bytes. 14 DLC +4 for mpls labels

D. The overhead consists of 22 bytes. 14 DLC + 8 for mpls labels

H-VPLS solves the data-plane and control-plane problems with the exception of one issue. What is the concern that H-VPLS does not solve?

A. Increased LSP count.

B. Number of TLDP sessions.

C. The amount of network touches.

D. FDB consumption.

E. Increased bandwidth and replication.

IEEE 802.3ah frames must be untagged.

A. TRUE

B. FALSE

Which of the following statements about a management VPLS are true? (Choose 2)

A. A management VPLS carries customer traffic over the non-blocking spoke-SDP

B. A VPLS service must be defined as a management VPLS upon creation to take on the role of a management VPLS

C. The state of a spoke-SDP within a user VPLS will take on the state of the spoke-sdp within the management VPLS.

D. The management VPLS must be created before the user VPLS.

How does PBB forward broadcast, unknown-unicast and multicast traffic from a B-VPLS to an l-VPLS?

A. The receiving PE checks the l-TAG in the l-SID to determine if there is a local l-VPLS on the node.

B. The receiving PE checks the l-SID in the l-TAG to determine if there is a local l-VPLS on the node.

C. The receiving PE checks the service label in the mpls header to determine if there is a local l- VPLS on the node.

D. The receiving PE checks the multicast B-DA to see if an l-SID has been mapped to the B-DA that matches a local l-VPLS on the node.