The correct interpretation is that for prefix 10.1.1.1/32, the local label is 16 and the remote label from LSR 10.1.1.2 is 17. This is because the show mpls ldp bindings command displays the Label Information Base (LIB), which lists every prefix learned via LDP along with two key bindings: the local label that this router (R3) has assigned, and the remote label advertised by a neighboring Label Switch Router (LSR). In the output, each "lib entry" shows a prefix, followed by its local binding and then the remote binding from a specific LSR—here, 10.1.1.2. On the ENCOR 350-401 exam, this command tests your ability to read the LIB and distinguish between locally assigned labels and labels learned from peers, a common point of confusion. A frequent trap is mixing up the local and remote labels, or assuming the "rev" number indicates label priority when it is simply a revision counter. Memory tip: think of "local" as what your router gives out, and "remote" as what your neighbor sends you—like a handshake where each side offers its own label.
CCNP MPLS Practice Question
This 350-401 practice question tests your understanding of mpls. 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.
A network engineer runs the following command on Router R3:
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
For prefix 10.1.1.1/32, the local label is 16 and the remote label from LSR 10.1.1.2 is 17.
The output shows the LIB (Label Information Base). For each prefix, there is a local label assigned by this router and a remote label learned from LSR 10.1.1.2. The rev number indicates the revision of the entry.
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.
✓
For prefix 10.1.1.1/32, the local label is 16 and the remote label from LSR 10.1.1.2 is 17.
Why this is correct
The output clearly shows local binding label 16 and remote binding label 17.
Related concept
Read the scenario before looking for a memorised answer.
✗
The router has learned label bindings from two different LDP peers.
Why it's wrong here
All remote bindings are from the same LSR: 10.1.1.2:0.
✗
The label for prefix 10.2.2.0/24 is 18 locally and 19 remotely, indicating that the remote LSR will use label 18.
Why it's wrong here
The remote label is 19, not 18. The local label is 18.
✗
The LIB entry for 10.3.3.0/24 has a revision number of 6, meaning it was the sixth entry added.
Why it's wrong here
The rev number is per entry, not a global counter; it indicates the revision of that specific entry.
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 350-401 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 350-401 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 — This question tests MPLS — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: For prefix 10.1.1.1/32, the local label is 16 and the remote label from LSR 10.1.1.2 is 17. — The output shows the LIB (Label Information Base). For each prefix, there is a local label assigned by this router and a remote label learned from LSR 10.1.1.2. The rev number indicates the revision of the entry.
What should I do if I get this 350-401 question wrong?
Identify which 350-401 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.
About these practice questions
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Variation 1. A network engineer runs the following command on Router R9:
R9# show mpls ldp bindings 10.9.9.0 255.255.255.0
lib entry: 10.9.9.0/24, rev 10
local binding: label: 22
remote binding: lsr: 10.9.9.1:0, label: 23
remote binding: lsr: 10.9.9.2:0, label: 24
remote binding: lsr: 10.9.9.3:0, label: 25
Based on this output, how many remote LDP peers have advertised a label for the prefix 10.9.9.0/24?
easy
A.1
B.2
✓ C.3
D.4
Why C: The output shows three remote bindings from different LSRs (10.9.9.1, 10.9.9.2, 10.9.9.3), each with a different label. So three remote peers have advertised labels.
Last reviewed: Jun 18, 2026
Question Discussion
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