350-501 MPLS and Segment Routing Practice Question
An engineer is configuring MPLS LDP on a Cisco router. The router is using downstream unsolicited mode and liberal label retention. Which statement correctly describes the label advertisement behavior?
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
✓
Labels are advertised to all LDP peers for all known prefixes without a request.
In downstream unsolicited mode, the router advertises labels for all known prefixes to all neighbors, even if the neighbor did not request them. Liberal label retention keeps all received labels, even if not currently used.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Labels are advertised to all LDP peers for all known prefixes without a request.
Why this is correct
Correct for downstream unsolicited mode.
- ✗
Labels are retained only for directly connected neighbors.
Why it's wrong here
Liberal retention keeps all labels.
- ✗
Label advertisements are sent only for prefixes learned via BGP.
Why it's wrong here
LDP advertises for IGP routes typically.
- ✗
Labels are advertised only when explicitly requested by a neighbor.
Why it's wrong here
That is downstream on demand mode.
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