IP ConnectivityDifficulty 2/5
On a multi-access Ethernet segment running OSPFv2, which router becomes the DR by default?
- AThe router with the highest interface priority, then the highest router ID
- BThe router with the most interfaces
- CThe router that joined the segment last
- DThe router with the lowest router ID
Show answer and rationale
Correct: A. DR election uses interface priority (default 1; 0 = never) and then the highest router ID as the tie-breaker. The election is not pre-emptive: an existing DR keeps its role.
- D — Highest, not lowest, RID wins ties.
- B — Interface count is irrelevant.
- C — Late joiners do not pre-empt an existing DR.