Implementing Cisco IP Routing (CCNP ROUTE, legacy) — Question 3

If routers in a single area are configured with the same priority value, what value does a router use for the OSPF Router ID in the absence of a loopback interface?

Answer options

• A. The lowest IP address of any physical interface
• B. The highest IP address of any physical interface
• C. The lowest IP address of any logical interface
• D. The highest IP address of any logical interface

Correct answer: B

Explanation

In OSPF, if no loopback interface is present and routers have the same priority, the router will select the highest IP address of any physical interface as its Router ID. The other options either reference the lowest IP address or logical interfaces, which do not apply in this scenario.