JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2025) — Question 75

Which two statements about BGP facilitate the prevention of routing loops within an autonomous system? (Choose two.)

Answer options

• A. Routes learned from IBGP neighbors are only advertised to other IBGP neighbors.
• B. Routes learned from IBGP neighbors are not readvertised to other IBGP neighbors.
• C. IBGP sessions must be configured as a logical full mesh.
• D. IBGP sessions must be configured as a physical full mesh.

Correct answer: B, C

Explanation

Option B is correct because it ensures that routes from one IBGP neighbor are not advertised to another, preventing loops. Option C is also correct as establishing a logical full mesh allows all IBGP routers to share routing information effectively, avoiding inconsistencies. Options A and D are incorrect; while they relate to IBGP, they do not directly contribute to loop prevention in the same way.