JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing — Question 47

Which three functions are performed by an OSPF area border router (ABR)? (Choose three)

Answer options

• A. flooding Summary LSAs to connected areas
• B. flooding ASBR Summary LSAs to connected areas
• C. generating all Router LSAs for connected neighbors
• D. performing summarization on routes headed to Area 0
• E. flooding NSSA External LSAs to Area 0

Correct answer: A, B, D

Explanation

The correct answers, A, B, and D, highlight the role of the ABR in managing summary Link State Advertisements (LSAs) and summarizing routes for efficient routing. Option C is incorrect because the ABR does not generate all Router LSAs; that function is performed by each router within its area. Option E is also incorrect since NSSA External LSAs are not flooded to Area 0 by the ABR.