How can you configure an OSPF Default Route?

To configure an OSPF (Open Shortest Path First) default route, adding the command 'default-information originate always' within the OSPF configuration is the correct approach. This command ensures that OSPF advertisements for the default route (0.0.0.0) are sent throughout the OSPF areas, indicating to the OSPF routers that a default route exists.

When using this command, OSPF will propagate the default route to other routers in its routing domain, which allows those routers to use this route for any destination that does not match a more specific route in their own routing tables. The use of "always" means that the router will advertise the default route even if it does not have a default route configured in its IP routing table, which can be useful for ensuring that external networks are reachable.

This method is essential for scenarios where OSPF is used within an enterprise network, and there is a need to ensure that traffic destined for unknown networks is routed towards a common exit point, typically towards an Internet connection or another network segment. Thus, propagating the default route seamlessly to all OSPF neighbors ensures proper traffic flow across the network.

Other options involve commands that would not accomplish the same objective