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

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

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

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

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

What of the following is a key benefit of Active/Standby pseudowires?

Does not require the use of a layer 2 loop prevention protocol such as RSTP

The MDU does not need to support MPLS.

Can be used in ring networks of 4 or more nodes

The MDU does not have to be aware of the active/standby configuration

Which of the following statements is false?

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

VPLS provides L2 VPN services to CEs.

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

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

STP is not required to break the loop because of split-horizon rules.

If the traffic is primarily Unicast, a full mesh of SDPs is a simple and efficient design.

STP can be used to break the loop.

If the traffic is primarily multicast, a full mesh of SDPs is a simple and efficient design.

Why should you configure send-flush-on failure on your PE routers when using active/standby pseudowires?

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.

It flushes the local FDB speeding recovery

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.

It is not important to use send-flush-on-failure as Active/Standby signalling automatically converges the FDB in all VPLS instances

Free Nokia 4A0-105 Exam Practice Questions & Explanations

Last updated on: Oct 14, 2026
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