350-501 MPLS and Segment Routing Practice Question
In SR-MPLS, which mechanism replaces LDP for label distribution?
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
✓
IGP (IS-IS or OSPF) with Segment Routing extensions
Segment Routing replaces LDP by using IGP extensions (IS-IS or OSPF) to advertise Prefix-SIDs (Node-SIDs) and Adjacency-SIDs. In IS-IS, TLV 242 (SR Capabilities) advertises the SRGB, while Node-SIDs are advertised via Prefix-SID sub-TLVs (e.g., TLV 135 for IPv4), eliminating the need for a separate label distribution protocol.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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RSVP-TE
Why it's wrong here
RSVP-TE is used for traffic engineering, not for basic label distribution in SR.
- ✓
IGP (IS-IS or OSPF) with Segment Routing extensions
Why this is correct
Correct: IGP distributes SIDs.
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MPLS-TE
Why it's wrong here
MPLS-TE is a set of mechanisms, not a label distribution protocol.
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BGP-LU
Why it's wrong here
BGP-LU is used for inter-AS label distribution, not the primary replacement for LDP.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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