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350-401 Practice Question: Spanning-tree mode rapid-pvst What is the effect…
spanning-tree mode rapid-pvst
What is the effect of this global configuration command?
⚠ Common exam trap
Cisco often tests the distinction between 'rapid-pvst' (RSTP per VLAN) and 'mst' (MSTP, which maps multiple VLANs to fewer instances), and candidates may confuse 'rapid-pvst' with simply enabling RSTP globally without understanding it applies per VLAN.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The switch will use Rapid PVST+ for all VLANs, providing faster convergence than classic STP.
The command 'spanning-tree mode rapid-pvst' enables Rapid PVST+ (Per-VLAN Spanning Tree Plus) on the switch, which runs a separate instance of RSTP (802.1w) for each VLAN. This provides faster convergence than classic STP (802.1D) by using mechanisms such as sync/agreement handshakes, edge ports, and link types, while still maintaining per-VLAN topology independence.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The switch will use Rapid PVST+ for all VLANs, providing faster convergence than classic STP.
Why this is correct
Rapid PVST+ is the Cisco implementation of RSTP per VLAN.
- ✗
The switch will use MSTP for all VLANs.
Why it's wrong here
MSTP is configured with 'spanning-tree mode mst'.
- ✗
The switch will use classic STP for all VLANs.
Why it's wrong here
Classic STP is 'spanning-tree mode pvst'.
- ✗
The switch will disable STP on all ports.
Why it's wrong here
STP remains enabled; only the mode changes.
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