The answer is that the remote peer has label filtering applied. This is the most likely reason for no label bindings because the LDP session is fully operational and up, yet no label bindings are received; label filtering on the remote peer explicitly prevents the advertisement of label bindings for certain prefixes, even though the session itself remains active. On the Cisco SPCOR / CCNP Service Provider Core 350-501 exam, this scenario tests your understanding that an established LDP session does not guarantee label exchange—filtering policies like `label advertise` or `label accept` can silently block bindings. A common trap is assuming the session must be down or that IGP routes are missing, but the session state is UP with zero bindings, which points directly to filtering. Memory tip: “Session up, bindings none? Check the filter on the peer’s side.”
350-501 Architecture Practice Question
This 350-501 practice question tests your understanding of architecture. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
Refer to the exhibit. Based on the exhibit, what is the most likely reason for no label bindings?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The remote peer has label filtering applied
The LDP session is operational, but no label bindings are received. A common cause is that the remote peer has label filtering configured, preventing label advertisement. Option B: local disabling would not show session up with label bindings none? Actually local disabling might prevent sending, but receiving? Option C: IGP routes present? Not directly indicated. Option D: session is up, so not fully established is false.
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.
✗
The local router has disabled label advertisements
Why it's wrong here
If local disabled, the session might not be operational, or at least no labels sent, but could still receive? Not typical.
✗
The IGP routes are not present in the routing table
Why it's wrong here
IGP routes are needed for label binding, but absence would affect local labels, not remote bindings.
✗
The LDP session is not fully established
Why it's wrong here
The state is Oper, so session is fully established.
✓
The remote peer has label filtering applied
Why this is correct
Label filtering on the remote peer can prevent advertisement of labels.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
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 350-501 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.
What to study next
Got this wrong? Here's your next step.
Identify which 350-501 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.
Architecture — This question tests Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The remote peer has label filtering applied — The LDP session is operational, but no label bindings are received. A common cause is that the remote peer has label filtering configured, preventing label advertisement. Option B: local disabling would not show session up with label bindings none? Actually local disabling might prevent sending, but receiving? Option C: IGP routes present? Not directly indicated. Option D: session is up, so not fully established is false.
What should I do if I get this 350-501 question wrong?
Identify which 350-501 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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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