350-501 MPLS and Segment Routing Practice Question
Which TWO statements correctly describe Segment Routing characteristics? (Select two.)
⚠ Common exam trap
Cisco often tests the misconception that SR eliminates all per-prefix state from core routers, but in reality, core routers still maintain IGP per-prefix state and may hold SR-MPLS labels for those prefixes.
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
✓
The path is encoded as a label stack at the source router
Segment Routing (SR) encodes the forwarding path as an ordered list of segment identifiers (SIDs) pushed onto a label stack at the source router. This source-routing paradigm allows the ingress node to specify the exact path through the network without requiring intermediate routers to maintain per-flow state.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
All routers must be configured with the same SRGB value
Why it's wrong here
SRGB must be same only if using the same block; but can be different with mapping.
- ✓
The path is encoded as a label stack at the source router
Why this is correct
SR uses a label stack to specify the path.
- ✓
Label distribution does not rely on LDP or RSVP
Why this is correct
Labels are derived from IGP SIDs.
- ✗
SR eliminates all per-prefix state from core routers
Why it's wrong here
SR still requires per-prefix label forwarding entries.
- ✗
Traffic engineering policies are distributed via BGP without any IGP extension
Why it's wrong here
IGP extensions are needed to advertise prefix-SIDs and adjacency-SIDs.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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