300-420 · Question #410
300-420 Question #410: Real Exam Question with Answer & Explanation
The correct answer is D: - switch D configured as VLAN 10 primary root. Configuring link A as a Layer 3 routed link removes it from the Layer 2 topology, reducing the number of potential STP paths and preventing loops. Setting switch D as primary root and switch C as secondary root for VLAN 10 ensures predictable and optimal spanning-tree convergence
Question
Refer to the exhibit. These requirements must be met: - VLANs span multiple access switches. - All VLANs are trunked on all access switch uplinks to distribution switches. - The STP version is Rapid PVST+. Which design provides the fastest spanning-tree convergence?
Options
- A- switch D configured as VLAN 10 secondary root
- B- switch D configured as VLAN 10 secondary root
- C- switch D configured as VLAN 10 primary root
- D- switch D configured as VLAN 10 primary root
Explanation
Configuring link A as a Layer 3 routed link removes it from the Layer 2 topology, reducing the number of potential STP paths and preventing loops. Setting switch D as primary root and switch C as secondary root for VLAN 10 ensures predictable and optimal spanning-tree convergence with Rapid PVST+.
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