Network AccessDifficulty 3/5
Four switches run Rapid PVST+ with default priority. Which switch becomes the root bridge?
- AThe switch with the highest MAC address
- BThe switch with the most ports
- CThe switch with the lowest MAC address
- DThe switch that boots first
Show answer and rationale
Correct: C. With equal priorities (32768 + VLAN ID), the bridge ID tie-breaker is the lowest MAC address. Set a lower priority on your intended root rather than relying on MAC.
- A — Lowest, not highest, bridge ID wins.
- B — Port count is irrelevant to the election.
- D — Boot order does not affect the deterministic election.