350-501 MPLS and Segment Routing Practice Question
Which LDP label distribution mode is characterized by a router advertising labels for all prefixes in its routing table to all neighbors, regardless of whether they are needed?
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
✓
Downstream unsolicited with liberal label retention
Downstream unsolicited means the router sends label bindings without being asked; liberal label retention means it keeps all bindings even if not from the next hop.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Downstream on demand with conservative label retention
Why it's wrong here
Labels are requested only when needed and only kept if from the next hop.
- ✗
Downstream on demand with liberal label retention
Why it's wrong here
Labels are requested but all are kept.
- ✗
Downstream unsolicited with conservative label retention
Why it's wrong here
Labels are sent unsolicited but only kept if from the next hop.
- ✓
Downstream unsolicited with liberal label retention
Why this is correct
Correct. This is the default mode for LDP.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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