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Exam JN0-663 topic 1 question 1 discussion

Actual exam question from Juniper's JN0-663
Question #: 1
Topic #: 1
[All JN0-663 Questions]


You notice an inconsistency between the routing table and the OSPF database, as shown in the exhibit.
What are two reasons for this behavior? (Choose two.)

  • A. The LSA is a Type 4 LSA.
  • B. An OSPF export policy is being applied to the route.
  • C. An OSPF import policy is being applied to the route.
  • D. The LSA is a Type 5 LSA.
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Suggested Answer: BC

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DIbyam
1 week, 5 days ago
C and D are correct. Import policy in RT and OSPF External type 2 route.
upvoted 1 times
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Anniesyed1234
3 weeks, 4 days ago
C & D are correct
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minmon_6789
2 months ago
C and D are correct.
upvoted 1 times
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TT98
2 months, 1 week ago
Should be C&D. Export policy lists the name of the routing policy to be evaluated when routes are being exported from the routing table into OSPF. This rules out B because with prefix absent in route table, OSPF LSDB could not be populated.
upvoted 1 times
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ak_sisko
3 months, 1 week ago
C and D
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Juniperguy
3 months, 3 weeks ago
C and D. As this is an external route, LSA 5 is used for this. LSA 4 is used for discovering the ASBR. Also, as the route is in the RIB in, but not in the routing table, this has to be done by a import policy.
upvoted 2 times
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lam3n
4 months, 3 weeks ago
OSPF import policy allows you to prevent external routes from being added to the routing tables of OSPF neighbors. The import policy does not impact the OSPF database. This means that the import policy has no impact on the link-state advertisements. The filtering is done only on external routes in OSPF. C&D
upvoted 3 times
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mikkamilla
5 months, 2 weeks ago
you can have import policy in ospf, it doesn't impact the LSDB, but the routing table and it works only for external routes, as in this case. It's definitely C and D https://www.juniper.net/documentation/en_US/junos/topics/topic-map/ospf-routing-policy.html
upvoted 2 times
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ak_sisko
5 months, 2 weeks ago
I think B and D. In OSPF only export policy
upvoted 1 times
minmon_6789
2 months ago
You can apply an import policy in OSPF. OSPF import policies apply to external routes only. So C and D are correct.
upvoted 1 times
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mikkamilla
5 months, 2 weeks ago
I'd say it's C and D
upvoted 2 times
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