JN0-102 · Question #252
By default, which two statements are true about export routing policies? (Choose two.)
The correct answer is A. Export policies can evaluate only active routes. C. Export policies can be applied to the forwarding table. Export routing policies primarily evaluate active routes from the routing table and are applied to the forwarding table to control which routes are advertised or used.
Question
By default, which two statements are true about export routing policies? (Choose two.)
Options
- AExport policies can evaluate only active routes.
- BExport policies can evaluate all routes.
- CExport policies can be applied to the forwarding table.
- DExport policies can be applied directly to interfaces
How the community answered
(33 responses)- A94% (31)
- B3% (1)
- D3% (1)
Why each option
Export routing policies primarily evaluate active routes from the routing table and are applied to the forwarding table to control which routes are advertised or used.
Export policies are designed to control which routes from the routing table are advertised to other protocols or peers. By default, they only consider "active" routes - those that are currently deemed the best paths and are installed in the forwarding table. This ensures that only usable routes are redistributed.
Export policies typically evaluate only *active* routes by default, not *all* routes (including inactive ones) present in the routing information base.
Export policies dictate which routes are placed into the forwarding table (also known as the data plane's routing information base) or advertised out of a routing protocol. While they filter routes from the routing table (RIB), their ultimate impact is on what enters the forwarding table for actual packet forwarding.
Export policies are applied to routing protocols or to the routing table itself to influence what gets exported; they are not applied directly to physical network interfaces.
Concept tested: Export Routing Policy Defaults
Source: https://www.juniper.net/documentation/us/en/software/junos/policy/topics/concept/policy-routing-export-policies.html
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