A router with two LAN interfaces, two WAN interfaces, and one configured loopback interface is operating with OSPF as its routing protocol. What does the router OSPF process use to assign the router ID?

Question:
A router with two LAN interfaces, two WAN interfaces, and one configured loopback interface is operating with OSPF as its routing protocol. What does the router OSPF process use to assign the router ID?

• the highest IP address that is configured on the WAN interfaces
• the IP address of the interface that is configured with priority 0
• the highest IP address on the LAN interfaces
• the OSPF area ID that is configured on the interface with the highest IP address
• the loopback interface IP address

Explanation: OSPF requires a unique router ID on each router. The router ID can be configured manually with the # router-id command. If this command is not issued, then the OSPF process will use the highest IPv4 address on an active interface as the router ID, with preference give to loopback interfaces.

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