4A0-105 Exam Questions

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 man...

How is the Primary Bridge chosen in a VPLS?

What is the name of the feature supported on the Alcatel-Lucent 7750 SR that prevents MAC explosion in large VPLS deployments?

Redundant spoke-SDPs are used between 2 Metro networks for redundancy. How can load balancing be achieved across the redundant spoke-SDPs?

What is the default remote-age timer of a B-VPLS?

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?

What are the advantages of running a physical ring topology with a mesh of mesh-SDPs? (Choose 2)

What is the SA in the Ethernet frame used for by a layer 2 switch?

Which OAM tool can be used to dynamically learn the MAC address of a CE device connected to a SAP within a VPLS service?

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?

Click on the exhibit below. If the SDP between R2 and R1 goes down, what devices will be reachable from R2 through the VPLS?

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...

Assuming TLDP and RSVP are both being used in an MPLS network core which of the following statements is true?

What is the default fdb size for a VPLS service?

Which of the following technologies allows for two explicit VLAN tags to be received from a customer device?

What is the default service-mtu for a VPLS service?

In Active/Standby pseudowires a failed pseudowire has recovered. Under what circumstances will the active pseudowire revert to the previously failed link?

What are the limitations of a traditional layer 2 switch? (Choose 3}

If the command "disable-learning" has been added at the VPLS level, then MAC entries which have already been learned will not be aged.

MAC explosion is best described as a large amount of MAC addresses being withdrawn and relearned?

Click on the exhibit below. Study the diagram shown. What consideration should be given to the transport tunnel of SDP 300?

Which of the following describes the scope of the IEEE 802.3ah EFM standard? (Choose 3)

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 stateme...

Click on the exhibit below. Based on the output below which of the following statements is true?

Which element of IEEE 802.1ag is responsible for initiating CFM messages?

Click on the exhibit below. Assume PE-1 has a mesh-sdp configured to every PE node in both Metro networks. What could be done to prevent the bandwidth replication between Metro 1 a...

Click on the exhibit below. Which bridge will become the root bridge?

Why are provisioning requirements a factor that influence VPLS design? (Choose 2)

Click on the exhibit below. How many LSPs are required in total between Metro A and Metro B if 100 hierarchical VPLS services are deployed across the two metro networks?

Click on the exhibit below. The following VPLS services and SAPs have been configured. Which of the following statements is true?

When a PE node receives a PBB encapsulated frame on a B-VPLS, how does the PE determine which l-VPLS it belongs to?

Which of the following statements is false?

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? (Choo...

If the max remote-age timer of a B-VPLS is reached, what happens to the remotely learned MAC addresses in the l-VPLS service?

How do user VPLSs become associated with a management VPLS for redundant spoke- sdp connections?

Why is MAC explosion a factor to be considered when designing a large VPLS network? (Choose 2)

How can one ensure that a specific switch will be select as root in an STP network?

Click on the exhibit below. Based on the output below which of the following statements is true? (Choose 2)

What scaling factors should a network engineer be aware of when designing VPLS networks? (Choose 3)

Which of the following statements relating to VPLS is false?

What are the benefits of a hierarchical VPLS architecture? (Choose 3)

Which of the following statements is true?

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?

IEEE 802.3ah is similar to SONET/SDH in that it can count and report bit errors and frame errors.

Click on the exhibit below. A new site is added to PE-D of Metro B. Which of the following statement below is true?

Which protocol is used to signal the status of the active links between the PE and the CE in MC- LAG?

How does the IEEE 802.1ag loopback function differently from the loopback feature in 802.3ah? (Choose 2)

MC-LAG is only supported on network ports.

Which of the following statements about Spanning Tree Protocol is true?

Click on the exhibit below. Assume a CE router is connected to the SAP of each PE. The arp cache of all CE routers is empty and the FDB for VPLS 300 is empty. The CE router connect...