Cisco CCNA 200-301 Practice Question

To have the static route act as a backup to the dynamically learned route, you should configure it with an administrative distance higher than that of the dynamic routing protocol (e.g., Open Shortest Path First (OSPF) has a default administrative distance of 110). This way, the router will prefer the dynamically learned route when it's available (since it has a lower administrative distance) but will use the static route if the dynamic route fails. Configuring the static route with a lower or equal administrative distance would cause it to be preferred over the dynamic route, which is not desired. An administrative distance of 0 is reserved for directly connected routes and cannot be assigned to static routes.