350-501 Architecture Practice Question
Which TWO are characteristics of Segment Routing?
⚠ Common exam trap
Cisco often tests the misconception that Segment Routing requires a centralized controller (like SDN) or RSVP-like signaling, when in fact it can run purely with IGP-based distributed control and source-routed packet headers.
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
✓
Source routing capability
Segment Routing (SR) is a source-routing paradigm where the ingress node encodes a list of segments (instructions) into the packet header, guiding the packet through the network without intermediate routers needing to maintain per-flow state. Option B is correct because SR inherently provides source routing capability: the source node determines the path by stacking segment identifiers (SIDs), and transit nodes simply forward based on the top SID.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Uses only IPv6 data plane
Why it's wrong here
SR can use MPLS or IPv6.
- ✓
Source routing capability
Why this is correct
SR specifies path in the packet header.
- ✗
Requires RSVP-like signaling for path setup
Why it's wrong here
SR does not use explicit signaling.
- ✓
No per-flow state on transit routers
Why this is correct
Transit routers only forward based on labels.
- ✗
Requires a centralized SDN controller
Why it's wrong here
SR can operate without a central controller.
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