JN0-102 · Question #251
What is the default import routing policy for OSPF?
The correct answer is D. Accept all OSPF routes and install them into the inet.0 routing table. By default, OSPF accepts all routes learned from other OSPF routers and installs them into the main routing table (inet.0).
Question
What is the default import routing policy for OSPF?
Options
- AAccept all OSPF routes and install them into the inet.3 routing table.
- BAccept all OSPF routes and install them into the inet7.0 routing table.
- CAccept all OSPF routes and install them into the inet4.0 routing table.
- DAccept all OSPF routes and install them into the inet.0 routing table.
How the community answered
(26 responses)- A4% (1)
- B4% (1)
- D92% (24)
Why each option
By default, OSPF accepts all routes learned from other OSPF routers and installs them into the main routing table (inet.0).
The `inet.3` routing table is typically used for MPLS LDP routes, not directly for OSPF learned routes by default.
The `inet7.0` routing table is for IPv6 multicast routes, which is not the default target for OSPF unicast routes.
The `inet4.0` routing table is not a standard routing table in common networking operating systems; `inet.0` is the standard for IPv4 unicast.
OSPF, by default, accepts all routes that are learned from its OSPF neighbors and are valid according to its internal routing algorithm. These routes are then installed into the primary routing table, `inet.0`, which is the default table for IPv4 unicast routes. This behavior ensures that all OSPF-learned paths contribute to the network's overall routing decisions.
Concept tested: OSPF Default Import Policy
Source: https://www.juniper.net/documentation/us/en/software/junos/policy/topics/topic-map/policy-routing-default-policy.html
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