Refer to the exhibit. A customer requires a Layer 2 network designed to support: - 500 active logical ports - trunking of 30 VLANs - convergence of less than 1 second Which Spanning Tree Protocol…

PVST+ operates on the legacy 802.1D STP standard, which has slow convergence times (typically 30-50 seconds), failing to meet the "less than 1 second" requirement.

CST (Common Spanning Tree) refers to a single STP instance for all VLANs, operating on the slow 802.1D standard, which cannot meet the rapid convergence requirement.

RPVST+ (Rapid Per-VLAN Spanning Tree Plus) is based on IEEE 802.1w (Rapid Spanning Tree Protocol) and runs a separate, fast-converging instance of STP for each VLAN. This allows it to achieve convergence times of typically less than 1 second, directly meeting the critical requirement for rapid convergence for all 30 trunked VLANs.

MSTP (Multiple Spanning Tree Protocol) also offers rapid convergence by grouping multiple VLANs into spanning tree instances, but RPVST+ is a direct fit for rapid convergence on a per-VLAN basis and is commonly deployed for such requirements.