JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2025) — Question 85

You are asked to explore adding BGP route reflectors to allow for increased scale in your core network.

Which statement is correct in this scenario?

Answer options

• A. The cluster ID is required to prevent routing loops.
• B. Route reflectors are required whenever internal BGP (IBGP) sessions are needed.
• C. The cluster ID is not required to use route reflectors.
• D. Route reflectors require that the network is connected in a physical full mesh.

Correct answer: A

Explanation

The correct answer is A because the cluster ID is indeed necessary to prevent routing loops within the route reflector architecture. Option B is incorrect as route reflectors are not mandatory for all IBGP sessions; they are used to simplify the IBGP topology. Option C is false since while route reflectors can function without a cluster ID, having one is crucial for loop prevention. Option D is wrong as route reflectors allow for a non-full mesh topology, which is their primary purpose.