350-501 MPLS and Segment Routing Practice Question
An engineer is implementing MPLS-TE Fast Reroute for link protection. Which protection method provides a backup tunnel that bypasses a specific link, protecting all LSPs traversing that link?
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
✓
Bypass tunnel protecting the link
A bypass tunnel is a single tunnel protecting a link, carrying traffic for all LSPs that traverse that link. Detour tunnels are per-LSP.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Node protection bypass tunnel
Why it's wrong here
Node protection protects the next-hop node, not the link.
- ✓
Bypass tunnel protecting the link
Why this is correct
Correct: Bypass tunnel protects the entire link.
- ✗
1:1 detour tunnel per LSP
Why it's wrong here
Detour tunnels are per-LSP, not protecting all LSPs on the link.
- ✗
FRR using RSVP-TE path pre-emption
Why it's wrong here
Path pre-emption is not a protection method.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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