JNCIP-ENT: Juniper Networks Certified Professional – Enterprise Routing — Question 4

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?

Answer options

• 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.

Correct answer: D

Explanation

The correct answer is D because Type 2 metrics only consider the external cost, which makes R2's route preferred when both routes have the same external path cost. Type 1 metrics, used by R1, incorporate both internal and external costs, but in this scenario, R2's Type 2 metric is still more favorable for the route selection.