350-501 Architecture Practice Question
Which TWO of the following are advantages of segment routing over traditional LDP-based MPLS? (Choose two.)
⚠ Common exam trap
Cisco often tests the misconception that segment routing eliminates the IGP entirely, but in reality, SR relies on the IGP to distribute SIDs, so the IGP is still required.
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 the LDP protocol
Segment routing (SR-MPLS) eliminates the need for the LDP protocol by encoding MPLS labels directly in the IGP (e.g., OSPF or IS-IS) using extensions like RFC 8665 and RFC 8667. This simplifies the control plane by removing an entire protocol (LDP) and its associated state, reducing operational complexity and convergence time.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Reduces the number of BGP peers required
Why it's wrong here
SR does not affect BGP peering.
- ✓
Eliminates the need for the LDP protocol
Why this is correct
SR uses IGP extensions instead of LDP.
- ✗
Requires RSVP-TE for traffic engineering
Why it's wrong here
SR can do TE without RSVP-TE.
- ✓
Provides source routing capability
Why this is correct
SR allows the source to specify the path via segment lists.
- ✗
Eliminates the need for IGP
Why it's wrong here
SR still requires IGP for link-state.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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