JN0-102 · Question #96
Which source of routing information is preferred by default?
The correct answer is A. OSPF internal. By default, OSPF internal routes are preferred over other routing information sources like IS-IS Level 1, IS-IS Level 2, and OSPF external routes, due to their lower default preference value.
Question
Which source of routing information is preferred by default?
Options
- AOSPF internal
- BOSPF external
- CIS-IS Level 1
- DIS-IS Level 2
How the community answered
(26 responses)- A92% (24)
- C4% (1)
- D4% (1)
Why each option
By default, OSPF internal routes are preferred over other routing information sources like IS-IS Level 1, IS-IS Level 2, and OSPF external routes, due to their lower default preference value.
OSPF internal routes have a default preference value of 10 in Junos OS. This value is lower (more preferred) than the default preference values for IS-IS Level 1 (15), IS-IS Level 2 (18), and OSPF external routes (150).
OSPF external routes have a default preference of 150, which is significantly higher (less preferred) than OSPF internal routes.
IS-IS Level 1 routes have a default preference of 15, making them less preferred than OSPF internal routes.
IS-IS Level 2 routes have a default preference of 18, making them less preferred than OSPF internal routes.
Concept tested: Junos default route preference values
Source: https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/topic-map/routing-policy-route-selection-preference-values.html
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