NTC/362: Fundamentals of Networking
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NTC/362: Fundamentals of Networking
Q: Four OSPF routers connect to the same LAN. In a new election after all routers have been rebooted, which router wins the DR election?
A: R4, router-id 4.4.4.4, priority 1
Explanation: First, the DR election always chooses the BDR to become the DR if a BDR exists. However, the question states that all the routers just rebooted, so there should be no BDR to take over for the DR. As worded, the question creates a scenario where all routers compete equally to become DR.
The routers choose the router with the highest OSPF interface priority, and if a tie, they then use the router with the highest router ID. In this case, the answers show routers with different priorities, so no ties exist based on priority. As a result, R1, with the highest priority (4), becomes the DR.
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