H12-821_V1.0 · Question #953
After the stack is split, the party that loses the MAD election will be in the ___ state.
The correct answer is A. Recover. After a VSS or stacked switch system splits into two active units, both may believe they are the primary switch, creating a split-brain condition. MAD (Multi-Active Detection) is the mechanism used to identify this situation and resolve it by holding an election. The switch…
Question
Options
- ARecover
- B
- C
- D
How the community answered
(30 responses)- A73% (22)
- B7% (2)
- C3% (1)
- D17% (5)
Explanation
After a VSS or stacked switch system splits into two active units, both may believe they are the primary switch, creating a split-brain condition. MAD (Multi-Active Detection) is the mechanism used to identify this situation and resolve it by holding an election. The switch that loses the MAD election is placed into the Recovery state, where all of its data-plane interfaces are shut down to prevent duplicate IP addresses and MAC addresses from causing network instability -- only the MAD link itself remains active.
Options B, C, and D are blank in this question, meaning no competing choices were provided, so A stands as the only valid answer.
Memory tip: Think of "Recovery" as the loser being sent to the bench to recover while the winner keeps playing. The losing switch recovers quietly in the background with ports shut down until the stack issue is resolved and it can safely rejoin.
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