- The lowest IP address of any physical interface
- The highest IP address of any physical interface
- The lowest IP address of any logical interface
- The highest IP address of any logical interface
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Answer: Option 2
At the moment of OSPF process startup, the highest IP address on any active interface will be the Router ID (RID) of the router. If you have a loopback interface configured (logical interface), then that will override the interface IP address and become the RID of the router automatically.
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