JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2025) — Question 10

Which two statements concerning IS-IS adjacencies are correct? (Choose two.)

Answer options

• A. For Level 1 adjacencies, the area IDs can be different.
• B. For Level 2 adjacencies, the area IDs can be different.
• C. Level 2 routers can form an adjacency with Level 1 routers.
• D. Level 2 routers do not form adjacencies with Level 1 routers.

Correct answer: B, C

Explanation

Option B is correct because Level 2 adjacencies can indeed have different area IDs. Option C is also correct as Level 2 routers are capable of forming adjacencies with Level 1 routers. Options A and D are incorrect because Level 1 adjacencies require the same area ID, and Level 2 routers do not avoid forming adjacencies with Level 1 routers.