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.

Which of the following statements is false?

A. VPLS is a bridged LAN service.

B. VPLS provides L2 VPN services to CEs.

C. VPLS is a point-to-point service where CEs are presented with point-to-point virtual circuits.

D. CEs that are members of the same VPLS service instance communicate with each other as if they are connected via a bridged LAN.

Click on the exhibit below.

If the SDP between R2 and R1 goes down, what devices will be reachable from R2 through the VPLS?

A. Only R4 will be reachable through the VPLS.

B. All devices will be reachable through the VPLS.

C. R4 and R3 will remain reachable.

D. No devices will be reachable.

How is the Primary Bridge chosen in a VPLS?

A. The PE devices participating in the VPLS mesh 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.

Consider a large metro-to-metro VPLS network interconnected with a mesh of mesh-SDPs. Which of the following statements does NOT apply to this situation?

A. Bandwidth and replication inefficiency can occur on inter-metro links if there is a lot of multicast traffic

B. The number of control sessions grows exponentially in a fully meshed network.

C. Spanning-tree is required to prevent loops when using mesh SDPs on the inter-metro links.

D. Network touches increase with each node added to the mesh.

Click on the exhibit below.

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

A. The SDP must be configured to use GRE encapsulation.

B. The SDP must follow the same path as the user's SDP.

C. The SDP should be configured to use an RSVP signaled transport with fast reroute.

D. The SDP must be the same as the user's SDP.

Which service component in the data plane uniquely identifies a VPLS to the far end PE node?

A. SDP id

B. Service ID

C. VC Label

D. Tunnel Label

E. Customer id

A LAG is configured with LACP passive mode enabled. When will LACP packets be sent?

A. On initialization and then every hello-interval.

B. Only after receiving LACP packets.

C. Every 1 second.

D. Never.

Click on the exhibit below.

Based on the following configuration which VLANs will be managed by the management VPLS?

A. VLANs 1-4094

B. VLAN 0

C. There is not enough information provided

D. None, this is an invalid configuration

Which of the following needs to be considered when designing Ethernet networks with redundancy?

A. Processing the TTL takes extra time.

B. MAC learning rate is doubled.

C. FDB size is doubled.

D. Requires a protocol to remove loops.