350-501 MPLS and Segment Routing Practice Question
An engineer is configuring MPLS-TE FRR for link protection. Which of the following options describes a 1:1 protection scheme where a dedicated detour LSP is created for each protected LSP?
⚠ Common exam trap
Cisco often tests the distinction between 1:1 (detour LSP) and 1:N (bypass tunnel) protection schemes, and the trap here is that candidates confuse 'bypass tunnel protecting multiple LSPs' (facility backup) with a dedicated detour, or assume 'node protection' is the same as link protection.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Detour LSP for each protected LSP
In MPLS-TE Fast Reroute (FRR), a 1:1 protection scheme means a dedicated detour LSP is created for each protected LSP. This provides per-LSP backup, ensuring that if a link fails, traffic is immediately switched to the detour tunnel. Option C correctly describes this exact mechanism, where each protected LSP has its own pre-established detour path.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Shared mesh protection
Why it's wrong here
A different concept in optical networks.
- ✗
Bypass tunnel protecting multiple LSPs
Why it's wrong here
That is N:1 protection (facility backup).
- ✓
Detour LSP for each protected LSP
Why this is correct
Correct. 1:1 detour is per-LSP.
- ✗
Node protection bypass tunnel
Why it's wrong here
Protects against node failure, not link failure.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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