Which spanning-tree enhancement prevents the spanning-tree topology from changing by blocking a port that receives a superior BPDU?
- BDPU filter
- BPDU guard
- root guard
- PortFast
Explanation: Root guard prevents the placement of the root bridge from changing by blocking any port that receives a superior BPDU. A superior BPDU is one with a higher root bridge ID than the currently selected root bridge has.
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