- A
SR-MPLS uses a global label block (SRGB) that is consistent across the domain.
Correct. SRGB is configured consistently.
- B
SR-MPLS requires LDP for label distribution.
Why wrong: SR-MPLS uses IGP extensions, not LDP.
- C
SR-MPLS supports only dynamic label allocation.
Why wrong: SR-MPLS uses pre-allocated SIDs.
- D
SR-MPLS allocates a per-prefix label (Node SID) for each router's loopback.
Correct. Node SID is a prefix SID.
- E
SR-MPLS requires RSVP-TE for TE tunnels.
Why wrong: SR-TE does not need RSVP.
Question 352 of 1,000
350-501 MPLS and Segment Routing Practice Question
This 350-501 practice question tests your understanding of mpls and segment routing. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Which TWO statements about SR-MPLS compared to LDP are correct? (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
✓
SR-MPLS uses a global label block (SRGB) that is consistent across the domain.
Option A is correct because SR-MPLS uses a Segment Routing Global Block (SRGB), which is a reserved label range (e.g., 16000–23999 per RFC 8660) that is configured consistently across all routers in the SR domain. This global consistency allows any router to interpret a label from the SRGB as the same topological or service instruction, eliminating the need for per-hop label negotiation.
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.
- ✓
SR-MPLS uses a global label block (SRGB) that is consistent across the domain.
Why this is correct
Correct. SRGB is configured consistently.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
SR-MPLS requires LDP for label distribution.
Why it's wrong here
SR-MPLS uses IGP extensions, not LDP.
- ✗
SR-MPLS supports only dynamic label allocation.
Why it's wrong here
SR-MPLS uses pre-allocated SIDs.
- ✓
SR-MPLS allocates a per-prefix label (Node SID) for each router's loopback.
Why this is correct
Correct. Node SID is a prefix SID.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
SR-MPLS requires RSVP-TE for TE tunnels.
Why it's wrong here
SR-TE does not need RSVP.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that SR-MPLS is dependent on LDP or RSVP-TE, when in fact SR-MPLS is designed to replace these protocols by leveraging IGP for label distribution and SR-TE policies for traffic engineering.
Detailed technical explanation
How to think about this question
The Node SID (prefix-SID) in SR-MPLS is a per-prefix label allocated for each router's loopback, typically from the SRGB, and is advertised via IGP extensions (e.g., IS-IS with sub-TLV 149 or OSPF with Opaque LSA). This label is globally unique within the domain, enabling strict or loose source routing without per-flow state in transit routers, which is a key advantage over LDP's per-hop label binding.
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.
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MPLS and Segment Routing — study guide chapter
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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: SR-MPLS uses a global label block (SRGB) that is consistent across the domain. — Option A is correct because SR-MPLS uses a Segment Routing Global Block (SRGB), which is a reserved label range (e.g., 16000–23999 per RFC 8660) that is configured consistently across all routers in the SR domain. This global consistency allows any router to interpret a label from the SRGB as the same topological or service instruction, eliminating the need for per-hop label negotiation.
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
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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.
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