CCNA Routing and Switching (legacy) — Question 3

Which spanning-tree protocol rides on top of another spanning-tree protocol?

Answer options

• A. MSTP
• B. RSTP
• C. PVST+
• D. Mono Spanning Tree A

Correct answer:

Explanation

The correct answer is C. PVST+ (Per VLAN Spanning Tree Plus) allows for the creation of separate spanning tree instances for each VLAN, effectively riding on top of the existing spanning-tree protocol. MSTP (A) and RSTP (B) are enhancements or variations of the original spanning-tree protocol but do not operate on top of it. Mono Spanning Tree A (D) is not a recognized standard spanning-tree protocol.