What is the default protocol preference for OSPF external routes?

The correct answer is C. 150. In Junos OS, the default protocol preference for OSPF external routes is 150. This preference value is higher than that of OSPF internal routes (10), reflecting their lower administrative distance or trustworthiness compared to routes originating within the OSPF area.

Routing Fundamentals

Question

Options

A10
B15
C150
D160

How the community answered

(26 responses)

B
4% (1)
C
92% (24)
D
4% (1)

Why each option

In Junos OS, the default protocol preference for OSPF external routes is 150. This preference value is higher than that of OSPF internal routes (10), reflecting their lower administrative distance or trustworthiness compared to routes originating within the OSPF area.

A10

10 is the default protocol preference for OSPF internal routes (Type 1 and Type 2).

B15

15 is the default protocol preference for IS-IS external routes, not OSPF external routes.

C150Correct

The default protocol preference for OSPF external routes (Type 5 and Type 7) in Junos OS is 150, which is higher than the preference for OSPF internal routes.

D160

160 is the default protocol preference for RIP routes.

Concept tested: Junos OS default protocol preferences (OSPF external)

Source: https://www.juniper.net/documentation/us/en/software/junos/routing-basics/topics/topic-map/routing-protocol-preferences-and-route-selection.html

Topics

#OSPF#protocol preference#external routes

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