JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing (2021) — Question 7

You asked to deploy a large-scale IS-IS network with multiple areas.
In this scenario, which two statements are true? (Choose two.)

Answer options

• A. The area IDs must be the same for Level 2 routers to from an adjacency.
• B. Level1 routers can from an adjacency with any other Level 1 router.
• C. Level1 routers can from an adjacency with any other Level 2 router.
• D. The area IDs must be the same for Level1 routers to from an adjacency.

Correct answer: B, D

Explanation

The correct answers are B and D. Level1 routers can indeed form an adjacency with any other Level 1 router, as they operate within the same layer, while D is true because Level1 routers must share the same area ID to establish an adjacency. A is incorrect because Level 2 routers do not require the same area ID to form an adjacency, and C is wrong since Level1 routers cannot form adjacencies with Level 2 routers.