350-501 MPLS and Segment Routing Practice Question
In SR-TE, a headend router is configured with an SR Policy using an explicit candidate path that includes a segment list [100, 200, 300]. If all routers have the same SRGB starting at 10000, what is the actual outgoing label stack for the first segment?
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
✓
10100, 10200, 10300
In SR-MPLS, the SID values in the segment list are relative to the SRGB. If the SRGB starts at 10000, a SID value of 100 corresponds to label 10100 (10000 + 100). So the first segment label is 10100.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
100, 200, 300
Why it's wrong here
These are SID indices, not actual labels.
- ✓
10100, 10200, 10300
Why this is correct
Correct: SRGB base + index.
- ✗
10000, 20000, 30000
Why it's wrong here
Incorrect calculation.
- ✗
Labels depend on LDP allocation
Why it's wrong here
SR uses SRGB.
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