While reviewing an existing network design, you are discussing the characteristics of different STP versions. Which protocol minimizes unicast flooding during a Topology Change Notification in a Layer 2 switched network with many VLANs?
B (MST — Multiple Spanning Tree): Bundles multiple VLANs into fewer STP instances, minimizing the scope of TCN propagation, which helps reduce MAC table flushing and unicast flooding.
Why other options are incorrect:
A: PVRSTP still processes TCNs per VLAN, increasing flooding.
C: Legacy STP behaves similarly but is not optimized for multiple VLANs.
D: PVSTP+ generates TCNs per VLAN like PVRSTP.
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