350-501 MPLS and Segment Routing Practice Question
An engineer is configuring MPLS LDP on a Cisco router. The router uses downstream unsolicited mode with liberal label retention. Which behavior describes the label distribution and retention on this router?
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
✓
The router sends label bindings to all neighbors without receiving requests and retains all received label bindings.
Downstream unsolicited means the downstream router sends label bindings to all neighbors without being asked. Liberal label retention means the router keeps all received label bindings, even if the next hop is not reachable.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The router requests labels from neighbors and retains only labels for the best path.
Why it's wrong here
Describes downstream on demand with liberal retention.
- ✗
The router sends label bindings only for directly connected routes and discards labels from non-reachable next hops.
Why it's wrong here
Describes a mix of unsolicited and conservative.
- ✗
The router sends label bindings only in response to requests from upstream neighbors and retains only labels for directly connected next hops.
Why it's wrong here
Describes downstream on demand with conservative retention.
- ✓
The router sends label bindings to all neighbors without receiving requests and retains all received label bindings.
Why this is correct
Correct description.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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