JN0-102 · Question #109
Which statement is correct about policies in the Junos OS?
The correct answer is B. Import policies are used to filter routes destined for the routing table. Import policies in Junos OS are used to filter routes that are received from neighboring devices and are destined to be installed into the local routing table.
Question
Which statement is correct about policies in the Junos OS?
Options
- AImport policies are used to filter routes from the routing table to the forwarding table.
- BImport policies are used to filter routes destined for the routing table.
- CImport policies are used to filter routes being sent to neighboring devices.
- DImport policies are used to filter traffic entering the device.
How the community answered
(18 responses)- A6% (1)
- B89% (16)
- C6% (1)
Why each option
Import policies in Junos OS are used to filter routes that are received from neighboring devices and are destined to be installed into the local routing table.
Filtering routes from the routing table to the forwarding table is typically controlled by routing protocol preferences and next-hop resolution, not standard import policies.
Import policies are applied to routes as they are received from a routing protocol peer or source, before these routes are placed into the local routing table (RIB). They determine which routes are accepted into the device's routing information base.
Filtering routes being sent to neighboring devices is the function of export policies, not import policies.
Filtering traffic (data plane packets) entering the device is the function of firewall filters, not routing policies.
Concept tested: Junos routing policy - import definition
Source: https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/concept/policy-routing-overview.html
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