350-501 MPLS and Segment Routing Practice Question
In an MPLS network using RSVP-TE for traffic engineering, which two mechanisms can be used for fast reroute (FRR) protection? (Choose two.)
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
✓
Facility backup using a bypass tunnel
RSVP-TE FRR offers two protection methods: facility backup (bypass tunnel) and 1:1 protection (detour LSP). Global Repair is not a standard term; Local Protection is used in segment routing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Local Protection using segment routing adjacency SID
Why it's wrong here
SR FRR uses TI-LFA.
- ✗
Global Repair using a secondary LSP from headend
Why it's wrong here
Not a standard RSVP-TE FRR method.
- ✓
Facility backup using a bypass tunnel
Why this is correct
Correct: bypass tunnel protects multiple LSPs.
- ✗
Hot Standby Router Protocol (HSRP)
Why it's wrong here
HSRP is for first-hop redundancy.
- ✓
1:1 protection using a dedicated detour LSP
Why this is correct
Correct: detour per LSP.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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