JNCIP-SP: Juniper Networks Certified Professional – Service Provider (2023) — Question 46

You want to ensure that L1 IS-IS routers have only the most specific routes available from L2 IS-IS routers.

Which action accomplishes this task?

Answer options

• A. Configure the ignore-attached-bit parameter on all L1 routers.
• B. Configure all routers to be L1.
• C. Configure all routers to allow wide metrics.
• D. Configure the ignore-attached-bit parameter on all L2 routers.

Correct answer: A

Explanation

The correct answer is A because configuring the ignore-attached-bit parameter on L1 routers prevents them from receiving less specific routes from L2 routers, ensuring they only get the most specific routes. Options B and C do not address the requirement of filtering routes based on specificity, and option D would affect L2 routers instead of achieving the goal for L1 routers.