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350-401 · Question #758
350-401 Question #758: Real Exam Question with Answer & Explanation
The correct answer is A: It compares the downstream port states reported in received BPDUs.. The STP Dispute function compares downstream port states reported in BPDUs to identify inconsistencies, allowing the upstream switch to detect unidirectional link failures.
Submitted by tom_us· Mar 6, 2026DOMAIN_LIST_MISSING
Question
Which two statements about the STP dispute function are true? (Choose two)
Options
- AIt compares the downstream port states reported in received BPDUs.
- BThe upstream switch uses received BPDUs to detect unidirectional link failures.
- CThe downstream switch uses received BPDUs to detect unidirectional link failures.
- DWhen a designated port detects a conflict, it changes its role by reverting to a discarding state.
Explanation
The STP Dispute function compares downstream port states reported in BPDUs to identify inconsistencies, allowing the upstream switch to detect unidirectional link failures.
Common mistakes.
- C. The dispute mechanism is primarily initiated by the upstream designated port upon receiving conflicting BPDUs, rather than by the downstream switch actively detecting the dispute.
- D. When a designated port detects a conflict, it transitions its port state to discarding and sends Dispute BPDUs to resolve the conflict, rather than fundamentally changing its designated role.
Concept tested. STP Dispute mechanism
Reference. https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html
Topics
#STP dispute function#BPDUs
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