300-320 Question #330: Real Exam Question with Answer & Explanation

The correct answer is A: RPVST+. RPVST+ (Rapid Per-VLAN Spanning Tree Plus) is Cisco's implementation of IEEE 802.1w (RSTP) on a per-VLAN basis. Unlike classic STP (802.1D), which has five port states - Blocking, Listening, Learning, Forwarding, and Disabled - RSTP/RPVST+ consolidates these into three states: Di

Question

Which technology guarantees loop free network and does not contain the state "listening"?

Options

ARPVST+
BSTP
CVSS
DMEC

Explanation

RPVST+ (Rapid Per-VLAN Spanning Tree Plus) is Cisco's implementation of IEEE 802.1w (RSTP) on a per-VLAN basis. Unlike classic STP (802.1D), which has five port states - Blocking, Listening, Learning, Forwarding, and Disabled - RSTP/RPVST+ consolidates these into three states: Discarding (combines Blocking and Listening), Learning, and Forwarding. The 'Listening' state is eliminated, enabling much faster convergence (typically under 1 second vs. 30–50 seconds for classic STP). Both STP and RPVST+ guarantee a loop-free topology, but only RPVST+ removes the Listening state. VSS and MEC are Cisco high-availability technologies, not spanning tree variants.

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