When a floating static route is configured, which action ensures that the backup route is used when the primary route fails?
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A. B. C. D.D.
Sure, I'd be happy to explain in detail!
A floating static route is a backup route that is used when the primary route is unavailable. It is called "floating" because it has a higher administrative distance than the primary route, making it less preferred. The administrative distance is a metric used by routers to choose the best path when multiple routes to the same destination exist in the routing table. A lower administrative distance is preferred over a higher one.
Now, let's look at the answer choices:
A. The administrative distance must be higher on the primary route so that the backup route becomes secondary.
This answer is incorrect because it suggests that the backup route should have a lower administrative distance than the primary route, which is the opposite of what is needed for a floating static route.
B. The default-information originate command must be configured for the route to be installed into the routing table.
This answer is also incorrect because the default-information originate command is used to advertise a default route into a routing protocol, not to configure a floating static route.
C. The floating static route must have a lower administrative distance than the primary route so it is used as a backup.
This answer is incorrect because it suggests that the floating static route should have a lower administrative distance than the primary route, which is the opposite of what is needed for a floating static route.
D. The floating static route must have a higher administrative distance than the primary route so it is used as a backup.
This answer is correct! To configure a floating static route, the administrative distance of the backup route must be higher than that of the primary route. This ensures that the router will use the primary route as long as it is available, but will switch to the backup route if the primary route fails.
In summary, to ensure that a backup route is used when the primary route fails, a floating static route should be configured with a higher administrative distance than the primary route.