JNCIP-ENT: Juniper Networks Certified Professional – Enterprise Routing (2024) — Question 35

Which statement is correct about IS-IS?

Answer options

• A. IS-IS uses areas and an autonomous system.
• B. Level 1/2 routers automatically inject a default route to the nearest Level 1 router.
• C. Level 2 routers must share the same area address.
• D. Level 1 routers route traffic between autonomous systems.

Correct answer: A

Explanation

The correct answer is A because IS-IS indeed uses both areas and an autonomous system for its routing structure. Option B is incorrect as Level 1/2 routers do not automatically inject default routes to Level 1 routers. Option C is false since Level 2 routers can belong to different areas. Lastly, option D is incorrect because Level 1 routers do not handle inter-autonomous system routing.