350-501 MPLS and Segment Routing Practice Question
In Segment Routing (SR-MPLS), which IGP TLV is used by IS-IS to advertise the Node SID for a prefix?
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
✓
TLV 135 (Extended IP Reachability) with sub-TLV 3 for Prefix-SID.
IS-IS uses the IS-IS Router CAPABILITY TLV (135) with sub-TLV 19 to carry the SR-capable information and prefix-SID. Specifically, the Prefix-SID is advertised in the IS-IS Extended IP Reachability TLV (135) with sub-TLV 3.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
TLV 135 (Extended IP Reachability) with sub-TLV 3 for Prefix-SID.
Why this is correct
Correct.
- ✗
TLV 22 (IS Reachability) with sub-TLV 22 for Adjacency SID.
Why it's wrong here
That is for adjacency SID.
- ✗
TLV 130 (IP Address) with sub-TLV 1 for Node SID.
Why it's wrong here
Incorrect.
- ✗
TLV 137 (Dynamic hostname) with sub-TLV 5 for SID.
Why it's wrong here
Incorrect.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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