350-501 MPLS and Segment Routing Practice Question
Which TWO are benefits of using Segment Routing (SR) over traditional LDP-based MPLS?
⚠ Common exam trap
Cisco often tests the misconception that Segment Routing requires a specific IGP (like OSPF only) or that it reduces label imposition, when in fact SR is IGP-agnostic and label depth depends on the path encoding, not the protocol itself.
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
✓
Eliminates the need for LDP and RSVP-TE protocols.
Segment Routing (SR) eliminates the need for the Label Distribution Protocol (LDP) and Resource Reservation Protocol with Traffic Engineering (RSVP-TE) by encoding MPLS labels directly into the Interior Gateway Protocol (IGP), such as OSPF or IS-IS. This simplifies the control plane by removing these protocols entirely, reducing operational complexity and resource 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.
- ✓
Eliminates the need for LDP and RSVP-TE protocols.
Why this is correct
SR uses IGP to distribute labels, removing LDP and RSVP-TE.
- ✗
Requires only OSPF as the IGP.
Why it's wrong here
SR works with both OSPF and IS-IS.
- ✗
Reduces label imposition at the ingress PE.
Why it's wrong here
SR may increase label stack depth.
- ✗
Faster convergence due to BGP PIC.
Why it's wrong here
BGP PIC is not exclusive to SR; SR uses IGP convergence.
- ✓
Supports traffic engineering without RSVP-TE.
Why this is correct
SR-TE uses segment lists for explicit paths.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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