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4A0-101 Exam - Question 40


Click on the exhibit.

Router R5 is advertising the three loopbacks prefixes shown in OSPFv3. The following command is executed on router R1: R1# configure router ospf3 area 0 area-range FD00:11:11:5000:764.

Which of the following is TRUE regarding the OSPFv3 LSDB on R6?

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Correct Answer: C

Router R6 will have a single Inter-Area Prefix LSA to describe the summary prefix. This is because the command 'configure router ospf3 area 0 area-range FD00:11:11:5000::/64' on R1 creates a summary of the prefixes in Area 0, which is then propagated to other areas as a single Inter-Area Prefix LSA. As a result, R6, which is in Area 2, will receive a summary prefix description rather than individual prefixes for each loopback.

Discussion

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snowblackOption: C
Nov 20, 2020

FD00:11:11:5000::/64

DracoDOption: D
Jan 6, 2021

Shouldn't the Answer be D. The area-range summarization for the 3 loopbacks attached to R5 should have been applied on R1 on the 'area 1' context to summarize the routes. Since it applied on the wrong area, R6 could still get a IEP LSAs for each of the loopbacks.