350-501 MPLS and Segment Routing Practice Question
Which THREE of the following are benefits of using Segment Routing over LDP in an MPLS network? (Choose three.)
⚠ Common exam trap
Cisco often tests the misconception that Segment Routing eliminates all security concerns or that it mandates BGP-LU, when in fact SR's security model is similar to traditional MPLS and BGP-LU is optional for specific use cases like inter-domain label distribution.
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
✓
Enables traffic engineering without RSVP-TE.
Segment Routing (SR) can perform traffic engineering using SR-TE policies (via a controller or PCEP) or SR Flexible Algorithm, without requiring RSVP-TE. This eliminates the complexity of RSVP-TE's soft-state signaling and per-LSP state maintenance, relying instead on source-routed segment lists encoded in the packet header.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enables traffic engineering without RSVP-TE.
Why this is correct
Correct: SR-TE provides traffic engineering capabilities.
- ✓
Reduces the number of protocols required in the network.
Why this is correct
Correct: Fewer protocols to configure and troubleshoot.
- ✓
Eliminates the need for LDP and RSVP-TE in the core.
Why this is correct
Correct: SR uses IGP extensions instead of LDP and RSVP-TE.
- ✗
Provides inherent security against label spoofing.
Why it's wrong here
SR does not add security features.
- ✗
Requires BGP-LU for label distribution.
Why it's wrong here
SR uses IGP for label distribution; BGP-LU is optional.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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