JN0-102 · Question #110
Which statement is correct about policies in the Junos OS?
The correct answer is C. Export policies are used to filter routes being sent to neighboring devices. Export policies in Junos OS are used to filter and control which routes from the local routing table are advertised to neighboring devices via routing protocols.
Question
Which statement is correct about policies in the Junos OS?
Options
- AExport policies are used to filter routes from the RE forwarding table to the PFE forwarding table.
- BExport policies are used to filter routes destined for the routing table.
- CExport policies are used to filter routes being sent to neighboring devices.
- DExport policies are used to filter traffic leaving the device.
How the community answered
(39 responses)- B3% (1)
- C95% (37)
- D3% (1)
Why each option
Export policies in Junos OS are used to filter and control which routes from the local routing table are advertised to neighboring devices via routing protocols.
The Routing Engine (RE) does not have a 'forwarding table'; the forwarding table resides on the Packet Forwarding Engine (PFE), and filtering between RE and PFE is not the role of export policies.
Filtering routes destined for the routing table is the function of import policies, not export policies.
Export policies are applied to routes that are being advertised or propagated from the local routing table (RIB) to neighboring devices via a routing protocol. They determine which routes are allowed to be sent out to peers.
Filtering traffic (data plane packets) leaving the device is the function of firewall filters, not routing policies.
Concept tested: Junos routing policy - export definition
Source: https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/concept/policy-routing-overview.html
Topics
Community Discussion
No community discussion yet for this question.