JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing (2022) — Question 7

You are asked to change the default TTL handling behavior on your Junos device to ensure that the RSVP-signaled LSPs in your MPLS network cannot be mapped.
Which configuration should be performed to accomplish this task?

Answer options

• A. Configure the no-decrement-ttl parameter for each LSP on the ingress device
• B. Configure the no-propagate-ttl parameter for each LSP on the egress device
• C. Configure the no-propagate-ttl parameter for each LSP on the ingress device
• D. Configure the no-decrement-ttl parameter for each LSP on the egress device

Correct answer: A

Explanation

The correct answer is A because configuring the no-decrement-ttl parameter on the ingress device ensures that the TTL value is not decremented, preventing LSP mapping. Options B and D are incorrect as they address the egress device, and option C does not prevent mapping effectively as it pertains to propagating TTL instead of decrementing it.