N10-005 · Question #939
When a loop occurs, which of the following STP components determines which port to disable?
The correct answer is B. Root bridge. In STP, the root bridge is the central reference point for the entire spanning tree topology. All other switches calculate their best path to the root bridge using path cost and port priority. Ports that would create redundant (looping) paths are determined to be non-designated…
Question
When a loop occurs, which of the following STP components determines which port to disable?
Options
- AConvergence
- BRoot bridge
- CBPDU guard
- DMAC address
How the community answered
(31 responses)- A3% (1)
- B87% (27)
- C6% (2)
- D3% (1)
Explanation
In STP, the root bridge is the central reference point for the entire spanning tree topology. All other switches calculate their best path to the root bridge using path cost and port priority. Ports that would create redundant (looping) paths are determined to be non-designated and placed in a blocking state - a decision derived from each switch's distance to the root bridge. The root bridge's central role drives which ports on non-root switches become designated (forwarding) versus blocked. BPDU guard shuts down ports that receive unexpected BPDUs but doesn't determine loop topology; convergence is the process of reaching a stable state, not a component.
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