350-501 MPLS and Segment Routing Practice Question
Which TWO are characteristics of SR-MPLS when compared to LDP-based MPLS? (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
✓
Labels are distributed via IGP extensions.
SR-MPLS eliminates LDP and RSVP state, using IGP for label distribution (e.g., via IS-IS TLVs).
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 IPv6 SIDs only.
Why it's wrong here
SR-MPLS uses MPLS labels.
- ✗
Labels are distributed using LDP.
Why it's wrong here
SR-MPLS does not use LDP.
- ✓
Labels are distributed via IGP extensions.
Why this is correct
IGP (IS-IS/OSPF) carries Segment Routing labels.
- ✗
SR-MPLS requires RSVP-TE for traffic engineering.
Why it's wrong here
SR-MPLS can use SR-TE without RSVP.
- ✓
SR-MPLS reduces protocol state by eliminating LDP and RSVP.
Why this is correct
SR-MPLS simplifies the network.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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