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Exam JN0-643 topic 1 question 9 discussion

Actual exam question from Juniper's JN0-643
Question #: 9
Topic #: 1
[All JN0-643 Questions]

R1 and R2 are ASBRs in the same area, each with an equal cost external path to the same external network prefix. R1 advertises an external route into OSPF with a Type 1 metric. R2 advertises an external route into OSPF with a Type 2 metric.

Which route would be preferred?

  • A. R1's route is preferred because Type 1 metrics take into account the external cost only.
  • B. R1's route is preferred because Type 1 metrics take into account the internal and external cost.
  • C. R2's route is preferred because Type 2 metrics take into account the internal and external cost.
  • D. R2's route is preferred because Type 2 metrics take into account the external cost only.
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Suggested Answer: D 🗳️
by tester2478 at July 12, 2023, 2:08 p.m.

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tester2478
1 year, 4 months ago
Should be B Both Type 1 and Type 2 external metrics can be present in the AS at the same time. In that event, Type 1 external metrics always takes the precedence. Type 1 external paths are always preferred over Type 2 external paths. When all paths are Type 2 external paths, the paths with the smallest advertised Type 2 metric are always preferred. https://www.juniper.net/documentation/us/en/software/junos/ospf/topics/topic-map/ospf-overview.html
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