JNCIP-SP: Juniper Networks Certified Professional – Service Provider (2023) — Question 57

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

Answer options

• A. CSNPs are used to request a missing LSP.
• B. PSNPs are used to acknowledge a received LSP.
• C. PSNPs are used to request a missing LSP.
• D. CSNPs are used to acknowledge a received LSP.

Correct answer: B, C

Explanation

Option B is correct because PSNPs indeed serve the function of acknowledging received LSPs. Option C is also correct as PSNPs are specifically used to request any missing LSPs. Options A and D are incorrect because CSNPs are not used for these purposes; they are primarily for summarizing the LSPs in the network.