Question

If the switch reboots and all routers have to re-establish OSPF adjacencies, which routers will become the new DR and BDR?

1) Routers with the highest OSPF priority
2) Routers with the lowest OSPF priority
3) Routers with the highest router ID
4) Routers with the lowest router ID

Answer 1

OSPF elects the DR and BDR based on the highest OSPF priority; in the event of a tie, the highest router ID determines the DR and BDR.

Step-by-step explanation:

When an OSPF-enabled router reboots, the election for a new Designated Router (DR) and a Backup Designated Router (BDR) is based on specific criteria. Firstly, the router with the highest OSPF priority on the network will become the DR, and the router with the second-highest OSPF priority will become the BDR. If there is a tie in priority, or if all routers are set to the default priority of 1, the router with the highest router ID will win the election. The router ID is determined by the highest IP address on an OSPF-enabled interface or can be manually set to any unique value. Therefore, the correct answer to which routers will become the new DR and BDR if the switch reboots is: 1) Routers with the highest OSPF priority, and if there's a tie, 3) Routers with the highest router ID.