- A
Shared mesh protection
Why wrong: A different concept in optical networks.
- B
Bypass tunnel protecting multiple LSPs
Why wrong: That is N:1 protection (facility backup).
- C
Detour LSP for each protected LSP
Correct. 1:1 detour is per-LSP.
- D
Node protection bypass tunnel
Why wrong: Protects against node failure, not link failure.
Question 293 of 1,000
350-501 MPLS and Segment Routing Practice Question
This 350-501 practice question tests your understanding of mpls and segment routing. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An engineer is configuring MPLS-TE FRR for link protection. Which of the following options describes a 1:1 protection scheme where a dedicated detour LSP is created for each protected LSP?
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
✓
Detour LSP for each protected LSP
In MPLS-TE Fast Reroute (FRR), a 1:1 protection scheme means a dedicated detour LSP is created for each protected LSP. This provides per-LSP backup, ensuring that if a link fails, traffic is immediately switched to the detour tunnel. Option C correctly describes this exact mechanism, where each protected LSP has its own pre-established detour path.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Shared mesh protection
Why it's wrong here
A different concept in optical networks.
- ✗
Bypass tunnel protecting multiple LSPs
Why it's wrong here
That is N:1 protection (facility backup).
- ✓
Detour LSP for each protected LSP
Why this is correct
Correct. 1:1 detour is per-LSP.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Node protection bypass tunnel
Why it's wrong here
Protects against node failure, not link failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between 1:1 (detour LSP) and 1:N (bypass tunnel) protection schemes, and the trap here is that candidates confuse 'bypass tunnel protecting multiple LSPs' (facility backup) with a dedicated detour, or assume 'node protection' is the same as link protection.
Detailed technical explanation
How to think about this question
The detour LSP is signaled using RSVP-TE with the FAST_REROUTE object, which includes the 'Setup Priority' and 'Holding Priority' to ensure the detour can preempt lower-priority LSPs if needed. In a 1:1 detour model, each protected LSP has its own unique detour path, which can be optimized for specific constraints (e.g., bandwidth, affinity) but consumes more label space and signaling overhead compared to facility backup. Real-world deployments often use facility backup (bypass tunnels) for scalability, but detour LSPs are useful when strict per-LSP SLA guarantees are required.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 350-501 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
MPLS and Segment Routing — study guide chapter
Learn the concepts, then practise the questions
- →
MPLS and Segment Routing practice questions
Targeted practice on this topic area only
- →
All 350-501 questions
1,000 questions across all exam domains
- →
Cisco SPCOR / CCNP Service Provider Core 350-501 study guide
Full concept coverage aligned to exam objectives
- →
350-501 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related 350-501 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
MPLS and Segment Routing practice questions
Practise 350-501 questions linked to MPLS and Segment Routing.
Automation and Quality of Services practice questions
Practise 350-501 questions linked to Automation and Quality of Services.
Architecture practice questions
Practise 350-501 questions linked to Architecture.
Networking practice questions
Practise 350-501 questions linked to Networking.
Security and Services practice questions
Practise 350-501 questions linked to Security and Services.
Automation and Quality of Service practice questions
Practise 350-501 questions linked to Automation and Quality of Service.
Services practice questions
Practise 350-501 questions linked to Services.
Automation and Assurance practice questions
Practise 350-501 questions linked to Automation and Assurance.
350-501 fundamentals practice questions
Practise 350-501 questions linked to 350-501 fundamentals.
350-501 scenario practice questions
Practise 350-501 questions linked to 350-501 scenario.
350-501 troubleshooting practice questions
Practise 350-501 questions linked to 350-501 troubleshooting.
Practice this exam
Start a free 350-501 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this 350-501 question test?
MPLS and Segment Routing — This question tests MPLS and Segment Routing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Detour LSP for each protected LSP — In MPLS-TE Fast Reroute (FRR), a 1:1 protection scheme means a dedicated detour LSP is created for each protected LSP. This provides per-LSP backup, ensuring that if a link fails, traffic is immediately switched to the detour tunnel. Option C correctly describes this exact mechanism, where each protected LSP has its own pre-established detour path.
What should I do if I get this 350-501 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jul 4, 2026
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.