350-501 MPLS and Segment Routing Practice Question
Which of the following best describes the function of 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
✓
It prunes links that do not satisfy constraints and then runs SPF on the remaining topology.
CSPF computes a path that meets constraints (bandwidth, affinity, etc.) and avoids links/ nodes not meeting them.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It distributes labels to LDP neighbors.
Why it's wrong here
That's LDP.
- ✗
It calculates the shortest path based solely on IGP metric.
Why it's wrong here
That's SPF, not CSPF.
- ✗
It signals RSVP-TE PATH messages.
Why it's wrong here
Signaling is done by RSVP itself.
- ✓
It prunes links that do not satisfy constraints and then runs SPF on the remaining topology.
Why this is correct
Correct. CSPF applies constraints first.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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