JNCIP-SP: Juniper Networks Certified Professional – Service Provider (2023) — Question 81

In which two ways does OSPF prevent routing loops in multi-area networks? (Choose two.)

Answer options

• A. All areas are required to connect as a full mesh.
• B. All areas are required to connect to area 0.
• C. The LFA algorithm prunes all looped paths within an area.
• D. The SPF algorithm prunes looped paths within an area.

Correct answer: B, D

Explanation

OSPF prevents routing loops by ensuring all areas connect to area 0, which is crucial for inter-area communication. The SPF algorithm is responsible for calculating the shortest path and removing any potential loops within an area, making option D correct. Options A and C do not accurately describe OSPF's mechanisms for loop prevention.