If all OSPF 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?

The correct answer is C. the highest IP address among its active interfaces. A router ID is determined in the following order: 1. using the router-id command under the OSPF process to statically configure the router ID. 2. using the highest IP address of the router’s loopback interfaces. 3. using the highest IP address of the router’s active physical inte

Submitted by tyler.j· Mar 5, 2026

Question

If all OSPF 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?

Options

Athe IP address of the first Fast Ethernet interface
Bthe IP address of the console management interface
Cthe highest IP address among its active interfaces
Dthe lowest IP address among its active interfaces
Ethe priority value until a loopback interface is configured

How the community answered

(23 responses)

B
4% (1)
C
91% (21)
D
4% (1)

Explanation

A router ID is determined in the following order: 1. using the router-id command under the OSPF process to statically configure the router ID. 2. using the highest IP address of the router’s loopback interfaces. 3. using the highest IP address of the router’s active physical interfaces.

Topics

#OSPF Router ID#OSPF election process

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