350-501 MPLS and Segment Routing Practice Question
In an MPLS network using LDP, which LDP mode allocates a label for every prefix in the routing table and advertises it to all LDP neighbors, regardless of whether the neighbor requests it?
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 (DU) mode means a router advertises labels for all its prefixes to all neighbors without waiting for a request.
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 liberal label retention
Why it's wrong here
Downstream on demand requires a request from the neighbor.
- ✗
Downstream unsolicited with conservative label retention
Why it's wrong here
Conservative retention only stores labels from next-hop neighbors.
- ✓
Downstream unsolicited with liberal label retention
Why this is correct
This is the default mode in Cisco IOS.
- ✗
Downstream on demand with conservative label retention
Why it's wrong here
Both characteristics are opposite to the question.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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