What adjustment should be made to a static route to ensure traffic utilizes the OSPF link only when it is operational?

What adjustment should be made to a static route to ensure traffic utilizes the OSPF link only when it is operational?

• A. Change the route metric to 10
• B. Change the administrative distance to 120
• C. Adjust the MTU size of the link
• D. Disable the static route completely

Answer: (B)

To ensure that traffic utilizes the OSPF link only when it is operational, changing the administrative distance to 120 is a strategic adjustment. In routing, administrative distance is a value assigned to routes that indicates the trustworthiness of the source of the routing information. OSPF typically has an administrative distance of 110, while static routes have a default administrative distance of 1. By setting the static route’s administrative distance at 120, the router would prefer OSPF routes over this static route. Consequently, if the OSPF link is up and operational, traffic will be sent via OSPF. If the OSPF link fails, then the static route would kick in since its administrative distance would be higher, reducing its priority compared to OSPF. This approach effectively allows dynamic routing to take precedence and ensures that the static route only becomes active when OSPF is not available. Adjustments to the route metric or MTU size do not directly control route preference based on link status, and disabling the static route altogether would eliminate any fallback if OSPF becomes unavailable. Therefore, choosing to modify the administrative distance is the most effective method for achieving the desired traffic flow behavior.

To ensure that traffic utilizes the OSPF link only when it is operational, changing the administrative distance to 120 is a strategic adjustment. In routing, administrative distance is a value assigned to routes that indicates the trustworthiness of the source of the routing information. OSPF typically has an administrative distance of 110, while static routes have a default administrative distance of 1.

By setting the static route’s administrative distance at 120, the router would prefer OSPF routes over this static route. Consequently, if the OSPF link is up and operational, traffic will be sent via OSPF. If the OSPF link fails, then the static route would kick in since its administrative distance would be higher, reducing its priority compared to OSPF. This approach effectively allows dynamic routing to take precedence and ensures that the static route only becomes active when OSPF is not available.

Adjustments to the route metric or MTU size do not directly control route preference based on link status, and disabling the static route altogether would eliminate any fallback if OSPF becomes unavailable. Therefore, choosing to modify the administrative distance is the most effective method for achieving the desired traffic flow behavior.