JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing (2022) — Question 59

Which two characteristics describe IS-IS? (Choose two.)

Answer options

• A. A collection of Level 1 routers serves as the IS-IS backbone
• B. Level 2 routers connect areas in an IS-IS autonomous system
• C. A collection of Level 2 routers serve as the IS-IS backbone
• D. A Level 1 IS routes between areas and toward other autonomous systems

Correct answer: B, C

Explanation

Option B is correct because Level 2 routers are responsible for connecting different areas within an IS-IS autonomous system. Option C is also correct as Level 2 routers indeed form the IS-IS backbone. Options A and D are incorrect because they misrepresent the role of Level 1 routers and their function in the IS-IS architecture.