350-501 MPLS and Segment Routing Practice Question
Which MPLS TE mechanism provides link protection by pre-establishing a backup LSP that bypasses a specific link, activated when the link fails?
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
RSVP-TE Fast Reroute uses bypass tunnels to protect links, providing local repair upon failure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
LDP FRR
Why it's wrong here
LDP FRR uses label stacking but is not specific to TE.
- ✓
Bypass tunnel
Why this is correct
Bypass tunnel protects a link or node.
- ✗
Detour tunnel
Why it's wrong here
Detour is a per-LSP backup, but bypass is per-link.
- ✗
TE backup path
Why it's wrong here
Not a standard term; backup LSP is correct.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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