- A
RSVP-TE
Why wrong: RSVP-TE is optional for TE.
- B
LDP
Correct: SR replaces LDP.
- C
IGP itself
Why wrong: IGP is used, not replaced.
- D
BGP
Why wrong: BGP is still used for VPN labels.
Question 552 of 1,000
350-501 MPLS and Segment Routing Practice Question
This 350-501 practice question tests your understanding of mpls and segment routing. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 label distribution protocol is replaced by segment routing in SR-MPLS deployments?
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
✓
LDP
In SR-MPLS deployments, segment routing replaces LDP as the label distribution protocol. LDP traditionally distributes labels for each prefix in the IGP, while segment routing uses the IGP itself to advertise prefix-SIDs and adjacency-SIDs, eliminating the need for a separate label distribution protocol. This simplifies the control plane and removes the dependency on LDP.
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.
- ✗
RSVP-TE
Why it's wrong here
RSVP-TE is optional for TE.
- ✓
LDP
Why this is correct
Correct: SR replaces LDP.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
IGP itself
Why it's wrong here
IGP is used, not replaced.
- ✗
BGP
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that segment routing replaces RSVP-TE for traffic engineering, but the question specifically asks about the label distribution protocol replaced by SR-MPLS, which is LDP, not RSVP-TE.
Detailed technical explanation
How to think about this question
LDP operates by establishing TCP sessions between LSRs and exchanging label bindings for every IGP prefix, creating a full mesh of LDP sessions. In SR-MPLS, the IGP (OSPF or IS-IS) is extended with sub-TLVs to carry the prefix-SID, and each router programs its forwarding table based on the SID, eliminating LDP's label exchange overhead. This is defined in RFC 8660 for MPLS data plane and RFC 8665 for IS-IS extensions, and it reduces control-plane complexity, especially in large-scale networks.
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 network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
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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: LDP — In SR-MPLS deployments, segment routing replaces LDP as the label distribution protocol. LDP traditionally distributes labels for each prefix in the IGP, while segment routing uses the IGP itself to advertise prefix-SIDs and adjacency-SIDs, eliminating the need for a separate label distribution protocol. This simplifies the control plane and removes the dependency on LDP.
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.
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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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