200-301 Question 343
Select 3In an OSPF broadcast network, a new router is added to the segment. Which of the following factors influence the selection of the Designated Router (DR) and Backup Designated Router (BDR) in this network?
- A
The router with the highest OSPF priority is selected first.
- B
The router with the highest router ID is selected in case of a priority tie.
- C
The router that has been in the network the longest is automatically chosen as DR.
- D
A router with an OSPF priority of 0 cannot become a DR or BDR.
- E
The DR and BDR roles are pre-assigned manually and cannot change dynamically.
Show answer and explanation
Correct answers: A, B, D
Explanation
In an OSPF broadcast network, the DR/BDR election process prioritizes routers based on their OSPF priority, with higher values taking precedence. In case of a tie, the router with the highest router ID is selected. Routers with a priority of 0 are excluded from the election process. The selection is dynamic unless manually configured, ensuring OSPF adapts to changes in the network.
- A. Correct.
Correct: In OSPF, the router with the highest priority is considered first when selecting the DR.
- B. Correct.
Correct: If two or more routers have the same priority, the router with the highest router ID is chosen as the tie-breaker.
- C. Incorrect.
Incorrect: The time a router has been in the network does not influence DR/BDR selection. OSPF uses priority and router ID for this purpose.
- D. Correct.
Correct: A router with a priority of 0 is excluded from DR and BDR elections.
- E. Incorrect.
Incorrect: While DR/BDR roles can be influenced manually by configuring priorities, OSPF can dynamically select DR/BDR based on the election process.