How does a router running OSPF determine its Router ID if it is not manually set?
It uses the lowest IP address among all active interfaces.
It selects the highest IP address among all active interfaces.
It chooses the highest IP address among its active loopback interfaces; if none are present, it uses the highest IP address of its active physical interfaces.
It uses the IP address of the first configured interface.
If the OSPF Router ID is not manually configured, the router determines its Router ID by selecting the highest IP address from its active loopback interfaces. If no loopback interfaces are present, it uses the highest IP address from its active physical interfaces. This approach ensures a stable and unique Router ID within the OSPF network. Selecting the highest IP address among all interfaces without prioritizing loopbacks is incorrect because OSPF prefers loopback interfaces due to their stability. Using the IP address of the first configured interface is not accurate since OSPF does not consider the order of interface configuration. Choosing the lowest IP address is incorrect because OSPF selects the highest IP address for the Router ID.
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Why does OSPF prefer loopback interfaces for Router ID calculation?
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What are loopback interfaces, and how do they function in networking?
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Cisco CCNA 200-301
IP Connectivity
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