The answer is Ordered Label Distribution Control mode. This is the default for LDP on Cisco IOS-XE because it ensures that a router will only advertise a label for a Forwarding Equivalence Class (FEC) if it has already received a label from its next-hop router or if it is the egress router itself. This prevents label black holes and guarantees that label-switched paths (LSPs) are built hop-by-hop from the egress back to the ingress, maintaining end-to-end label consistency. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of MPLS control plane behavior, often appearing in questions that contrast Ordered mode with Independent mode, where a router advertises a label without waiting for its downstream neighbor. A common trap is assuming Independent mode is the default, but Cisco IOS-XE strictly uses Ordered to avoid forwarding loops. Memory tip: think “Ordered” as “Only after Downstream” — the router waits for the next hop’s label before advertising its own.
300-410 MPLS Operations Practice Question
This 300-410 practice question tests your understanding of mpls operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
In MPLS, what is the default label distribution control mode for LDP on Cisco IOS-XE?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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Ordered Label Distribution Control mode
The default label distribution control mode is Ordered, meaning that a router will only advertise a label for a FEC if it has a label from its next hop or if it is the egress router.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Ordered Label Distribution Control mode
Why this is correct
Ordered mode is the default, ensuring labels are advertised only when the next hop has assigned a label.
Related concept
Read the scenario before looking for a memorised answer.
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Independent Label Distribution Control mode
Why it's wrong here
Independent mode allows a router to advertise a label without waiting for the next hop, but it is not the default.
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Liberal Label Retention mode
Why it's wrong here
Liberal retention is a label retention mode, not a control mode.
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Conservative Label Retention mode
Why it's wrong here
Conservative retention is a label retention mode, not a control mode.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
MPLS Operations — This question tests MPLS Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Ordered Label Distribution Control mode — The default label distribution control mode is Ordered, meaning that a router will only advertise a label for a FEC if it has a label from its next hop or if it is the egress router.
What should I do if I get this 300-410 question wrong?
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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