350-501 MPLS and Segment Routing Practice Question
In an MPLS network using LDP, which statement correctly describes the label distribution behavior for a given FEC?
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 unsolicited to all neighbors, and all labels are retained even if not used (liberal label retention).
LDP uses downstream unsolicited mode by default, where each LSR advertises labels for all FECs to all neighbors without being asked, and liberal label retention stores 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 unsolicited to all neighbors, and all labels are retained even if not used (liberal label retention).
Why this is correct
Correct: LDP default behavior.
- ✗
Labels are advertised only in response to a request from an upstream neighbor (downstream on demand).
Why it's wrong here
Downstream on demand is not the default; LDP uses downstream unsolicited.
- ✗
Labels are advertised unsolicited but only the best label for each FEC is retained (conservative label retention).
Why it's wrong here
Conservative retention is not default; LDP uses liberal retention.
- ✗
Labels are advertised only when the LSR has an outgoing label for the FEC (ordered label distribution).
Why it's wrong here
Ordered label distribution is an option but not the default behavior.
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