350-501 MPLS and Segment Routing Practice Question
What is the purpose of Constrained Shortest Path First (CSPF) in MPLS-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
✓
To find a path that satisfies traffic engineering constraints and is as short as possible
CSPF computes paths that meet TE constraints such as bandwidth, affinity, and explicit hops while optimizing the path cost.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
To distribute labels for LDP
Why it's wrong here
LDP does its own label distribution.
- ✗
To calculate the best path for L3VPN
Why it's wrong here
L3VPN uses MP-BGP.
- ✓
To find a path that satisfies traffic engineering constraints and is as short as possible
Why this is correct
Correct: CSPF applies constraints to SPF.
- ✗
To compute the shortest path without any constraints
Why it's wrong here
That is SPF, not CSPF.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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