By default, which two statements are true about export routing policies? (Choose two.)
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A. B. C. D.AC
The correct answers are A and C.
Export routing policies are used to control which routes are advertised from a router to its neighbors. When a route is selected for export, the export policy is applied to the route to determine if it should be advertised or not. Here are the detailed explanations of the two true statements:
A. Export policies can evaluate only active routes.
This statement is true because export policies are applied only to active routes in the routing table. The routing table contains all the routes that are learned by the router, but not all of them are active. An active route is a route that is currently being used to forward packets, so it makes sense to advertise only active routes. Export policies cannot evaluate inactive or hidden routes because they are not used for forwarding.
C. Export policies can be applied to the forwarding table.
This statement is true because export policies are applied to the routing table, which is also used to build the forwarding table. The forwarding table is a subset of the routing table that is used to forward packets based on the destination IP address. When a route is selected for export, it is added to the routing table, and if it is also active, it is added to the forwarding table. The export policy can then be applied to the route in the routing table, and the decision to advertise or not is based on the policy.
B and D are incorrect statements:
B. Export policies can evaluate all routes.
This statement is false because export policies can evaluate only active routes, not all routes. Inactive or hidden routes cannot be evaluated because they are not used for forwarding.
D. Export policies can be applied directly to interfaces.
This statement is false because export policies are not applied directly to interfaces. Export policies are applied to routes in the routing table, and the decision to advertise or not is based on the policy. Interfaces are used to send or receive packets, but they are not used to control routing policies.