350-501 Architecture Practice Question
A service provider is implementing Segment Routing (SR) with MPLS. Which three statements are true regarding SR-MPLS? (Choose three.)
⚠ Common exam trap
Cisco often tests the misconception that SR-MPLS requires a central controller for traffic engineering, but in reality, it supports both centralized and distributed TE models, and the key differentiator is the elimination of LDP/RSVP-TE.
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
✓
SR-MPLS does not require LDP or RSVP-TE
B is correct because SR-MPLS uses the MPLS data plane but replaces the control plane protocols LDP and RSVP-TE with IGP extensions (IS-IS or OSPF) to distribute segment information. This eliminates the need for these traditional label distribution protocols, simplifying network operations and reducing protocol overhead.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
SR-MPLS supports traffic engineering only with a central controller
Why it's wrong here
SR-MPLS supports distributed traffic engineering using TI-LFA and explicit paths.
- ✓
SR-MPLS does not require LDP or RSVP-TE
Why this is correct
SR uses IGP to distribute labels, eliminating the need for LDP or RSVP-TE.
- ✓
The SRGB must be globally unique across the domain
Why this is correct
To avoid label collisions, the SRGB should be unique per domain.
- ✗
Adjacency SIDs are advertised via BGP-LS
Why it's wrong here
Adjacency SIDs are primarily advertised via IGP extensions, not BGP-LS.
- ✓
Prefix-SIDs are bound to node loopbacks
Why this is correct
Prefix-SIDs are typically assigned to loopback interfaces to identify nodes.
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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.