350-501 Architecture Practice Question
Which two are requirements for deploying Segment Routing in a service provider network? (Choose two.)
⚠ Common exam trap
It's easy for candidates to assume LDP is still required for MPLS forwarding, but SR-MPLS replaces LDP entirely by using IGP-distributed SIDs, so the correct answer requires recognizing that LDP must be disabled, not enabled.
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
✓
IGP supporting segment routing (OSPF or IS-IS)
Segment Routing (SR) relies on an IGP (OSPF or IS-IS) that has been extended to advertise prefix-SIDs and adjacency-SIDs. The IGP extensions (RFC 8665 for IS-IS, RFC 8666 for OSPF) enable routers to compute source-routed paths without a separate signaling protocol. This is a fundamental requirement because SR-MPLS encodes the path as a stack of labels derived directly from the IGP SIDs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
TE tunnels must be configured
Why it's wrong here
TE tunnels are optional.
- ✓
IGP supporting segment routing (OSPF or IS-IS)
Why this is correct
The IGP must support SR extensions.
- ✗
LDP must be enabled
Why it's wrong here
LDP is not required; SR replaces LDP.
- ✗
All routers must run BGP
Why it's wrong here
BGP is not required for core SR.
- ✓
MPLS forwarding
Why this is correct
SR uses MPLS data plane.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.