350-501 MPLS and Segment Routing Practice Question
An engineer is deploying MPLS-TE with FRR using the 1:1 detour method. Which statement about link protection in this scenario is true?
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
✓
The detour LSP merges back with the main LSP after the protected link.
1:1 detour creates a one-to-one backup LSP for each protected LSP. The detour LSP is pre-signaled and protects against link failure by re-routing traffic around the failed link.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The detour LSP merges back with the main LSP after the protected link.
Why this is correct
Correct.
- ✗
The detour LSP is created dynamically after a failure is detected.
Why it's wrong here
Detour LSPs are pre-computed and signaled in advance.
- ✗
Link protection requires node protection to be configured.
Why it's wrong here
They are independent.
- ✗
A single bypass tunnel protects multiple LSPs over the same link.
Why it's wrong here
That describes facility backup (N:1).
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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