350-501 MPLS and Segment Routing Practice Question
Which three are required components for deploying Segment Routing in an MPLS network? (Choose three.)
⚠ Common exam trap
Cisco often tests the misconception that Segment Routing requires RSVP-TE or LDP, but the correct answer is that SR uses IGP extensions and the existing MPLS forwarding plane, eliminating the need for these legacy signaling protocols.
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
✓
MPLS forwarding capability on routers
B is correct because Segment Routing relies on the existing MPLS forwarding plane; routers must be capable of pushing, swapping, and popping MPLS labels based on the Segment Routing label stack. Without MPLS forwarding hardware or software support, the SR-MPLS data plane cannot function, even if the control plane is configured.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RSVP-TE signaling protocol
Why it's wrong here
SR uses IGP for signaling, not RSVP-TE.
- ✓
MPLS forwarding capability on routers
Why this is correct
Routers must support MPLS forwarding to process labels.
- ✓
Node-SID and Adj-SID assignments
Why this is correct
These SIDs are the foundation of SR-MPLS paths.
- ✓
IGP with Segment Routing extensions (OSPF or IS-IS)
Why this is correct
IGP distributes SIDs and topologies.
- ✗
LDP for label distribution
Why it's wrong here
SR replaces LDP; LDP is not required.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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