4A0-105 Online Practice Questions and Answers

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.

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.

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.

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. Relearning of the MAC address that was purged can only be done once customer traffic resumes.

B. Relearning of the 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.

Click on the exhibit below.

Which bridge will become the root bridge?

A. Bridge B

B. Bridge C

C. Bridge D

D. Bridge E

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.

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

A. Increases scalability

B. Reduces the FDB size within a VPLS instance

C. Reduces replication and bandwidth utilization from the MDU device to the core network

D. Easier to manage

E. Reduces the routing table size

In the IEEE 802.1 ag, how are merged services detected?

A. The MEP sees the CFM frame from a different MEG.

B. The MEP sees a different service-id in the frame sent by a MEP.

C. The MIP transmits the service-id for each service. The MIP should only see it's own service- id.

D. This is a function of 802,3ah EFM,

Which of the following functions must a PE router support when participating in a VPLS service? (Choose 3)

A. MAC learning

B. Frame replication

C. Frame fragmentation

D. Frame forwarding

E. Must discard frames with an unknown destination MAC

F. MSTP

Click on the exhibit below.

The service MTU on PE-A is 1514 bytes and the service MTU on PE-C is 1518 bytes. What is the status of the mesh-sdp between PE-A and PE-C?

A. The mesh-sdp will be up.

B. The mesh-sdp will be down.

C. The mesh-sdp will only be up on PE-A.

D. The mesh-sdp will only be up on PE-C.

One of the shortcomings of Spanning Tree Protocol (STP) is that it computes a valid, but not necessarily optimal, path between nodes within a network.

A. TRUE

B. FALSE

Click on the exhibit below.

Which ports will become root ports? (Choose 3)

A. Bridge B 1/1/3

B. Bridge B 1/1/2

C. Bridge C 1/1/2

D. Bridge C 2/1/1

E. Bridge D 1/1/1

F. Bridge D 1/1/3

G. Bridge E 1/1/1

H. Bridge E 1/1/3

Which of the following statements regarding unicastand multicast frames is true for a traditional layer 2 switch? (Choose 2)

A. Multicast frames only forward out ports that have a known receiver.

B. Unicast frames only forward out ports that have a known receiver.

C. If the FDB is empty, unicast and multicast frames are treated equally.

D. If the FDB has an entry for the unicast frame, both unicastand multicast are treated equally.

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.

A router has just learned the 10th MAC address while the FDB size is also set to 10. What is the likely outcome?

A. The frame is dropped.

B. The frame is always flooded

C. The frame is forwarded and MAC learning is automatically disabled.

D. The frame is discarded if the destination is unknown.

E. More information is required to determine the fate of this new frame.