Refer to the exhibit. If no router ID was manually configured, what would router R1 use as its OSPF router ID?

- 10.0.0.1
- 10.1.0.1
- 192.168.1.100
- 209.165.201.1
Explanation: Cisco routers determine the OSPF router ID based on a specific order of precedence. If an administrator does not explicitly configure a router ID using the router-id command, the router will automatically select the highest IPv4 address of any configured loopback interfaces. Because R1 has a loopback interface (Lo0) configured with the address 192.168.1.100, this address is chosen as the router ID, even if there are physical interfaces with active addresses. Physical interface addresses are only used as a last resort if no loopback interfaces exist.
Related exam: Enterprise Networking, Security, and Automation (Version 7.00) - ENSA Final Exam
