200-301 Question 344
Select 3In an OSPF broadcast network, a network engineer observes that multiple routers are connected to the same Ethernet segment. Which factors are considered during the election of the Designated Router (DR) and Backup Designated Router (BDR)?
- A
The router with the highest OSPF priority is elected DR.
- B
The router with the highest IP address is elected DR if OSPF priorities are the same.
- C
The router with the lowest OSPF priority is elected DR.
- D
The router with the lowest IP address is elected DR if OSPF priorities are the same.
- E
The election process can be influenced by manually configuring OSPF priority.
Show answer and explanation
Correct answers: A, B, E
Explanation
In OSPF broadcast networks, the Designated Router (DR) and Backup Designated Router (BDR) are elected to reduce the number of OSPF adjacencies and streamline the exchange of routing information. The election process prioritizes routers with the highest OSPF priority. If priorities are tied, the router with the highest IP address is chosen. Network administrators can manually configure OSPF priorities to influence this election.
- A. Correct.
Correct - The router with the highest OSPF priority is elected DR. This is the primary factor in DR/BDR selection.
- B. Correct.
Correct - If multiple routers have the same OSPF priority, the router with the highest IP address becomes the DR.
- C. Incorrect.
Incorrect - The router with the lowest OSPF priority is not elected DR. Instead, higher priorities take precedence.
- D. Incorrect.
Incorrect - The router with the lowest IP address is not elected DR. Instead, the highest IP address is used as a tiebreaker if priorities are the same.
- E. Correct.
Correct - The OSPF priority can be manually configured to influence the DR/BDR election process.