Cisco CCNA 200-301 Practice Question

To configure a backup route that is only used when the primary dynamic route fails, the administrator should configure a static route with an administrative distance higher than that of the dynamic routing protocol. Dynamic routing protocols have specific default administrative distances (e.g., OSPF is 110). By assigning the static route an administrative distance greater than the dynamic route's administrative distance, the router will prefer the dynamic route when it is available and use the static route only if the dynamic route fails. Configuring a static route with the default or lower administrative distance would make the router prefer the static route over the dynamic route, which is not desired. Adjusting the cost within the dynamic routing protocol affects route selection inside the protocol but does not set up an external backup route.