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JN0-102 · Question #226

Which two statements are correct regarding default protocol preference values? (Choose two.)

The correct answer is A. RIP is preferred over OSPF external routes. C. OSPF's preference value is lower than BGP.. RIP routes are preferred over OSPF external routes, and OSPF routes are generally preferred over BGP routes due to their lower default preference values.

Routing Fundamentals

Question

Which two statements are correct regarding default protocol preference values? (Choose two.)

Options

  • ARIP is preferred over OSPF external routes.
  • BDirect, local, and static routes have the same preference value.
  • COSPF's preference value is lower than BGP.
  • DOSPF has a single preference value for both internal and external routes.

How the community answered

(32 responses)
  • A
    94% (30)
  • B
    3% (1)
  • D
    3% (1)

Why each option

RIP routes are preferred over OSPF external routes, and OSPF routes are generally preferred over BGP routes due to their lower default preference values.

ARIP is preferred over OSPF external routes.Correct

The default preference for RIP is 100, while the default preference for OSPF external routes (Type 1/2) is 150. Since a lower preference value indicates higher preference, RIP routes are preferred over OSPF external routes.

BDirect, local, and static routes have the same preference value.

Direct and local routes have a default preference of 0, but static routes have a default preference of 5; thus, they do not all share the same preference value.

COSPF's preference value is lower than BGP.Correct

OSPF internal routes have a default preference of 10, and OSPF external routes (Type 1/2) have a default preference of 150. BGP routes (both IBGP and EBGP) have a default preference of 170. Therefore, OSPF's preference values are consistently lower than BGP's, meaning OSPF routes are preferred.

DOSPF has a single preference value for both internal and external routes.

OSPF has distinct default preference values for internal routes (10) and external routes (150 for Type 1/2), meaning it does not utilize a single preference value for both types of routes.

Concept tested: Default route preference comparison

Source: https://www.juniper.net/documentation/us/en/software/junos/routing-overview/topics/topic-map/routing-protocols-preference-values.html

Topics

#route preference#protocol preference#RIP#OSPF#BGP

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