Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 532

Which two reasons would cause an LSP to break between two PE routers? (Choose two.)

Answer options

• A. lost LDP adjacency
• B. matching labels
• C. prefix mismatch
• D. IGP hello adjacency
• E. MPLS not enabled

Correct answer: A, C

Explanation

The correct answers, A and C, indicate that losing LDP adjacency can prevent label distribution, while a prefix mismatch can lead to routing inconsistencies. Options B, D, and E do not directly cause an LSP to break; matching labels is necessary for LSP operation, IGP hello adjacency pertains to IGP routing protocols rather than LSPs, and MPLS not being enabled would prevent LSP establishment from the outset rather than breaking an existing one.