350-501 MPLS and Segment Routing Practice Question
In MPLS-TE Fast Reroute (FRR), what is a 'detour'?
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
✓
A backup LSP that protects a single primary LSP
A detour is a 1:1 protection mechanism where a backup LSP is created for each protected LSP, often pre-signaled.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A secondary path for load balancing
Why it's wrong here
FRR is for protection, not load balancing.
- ✓
A backup LSP that protects a single primary LSP
Why this is correct
Correct: Detour provides 1:1 protection.
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A bypass tunnel that protects multiple LSPs
Why it's wrong here
That describes a bypass tunnel (1:N).
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A mechanism to reroute traffic after failure detection
Why it's wrong here
That is the general idea of FRR, but detour is a specific type.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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