The correct commands are show ip cef vrf CUSTOMER 10.1.1.0/24 detail, show ip bgp vpnv4 vrf CUSTOMER 10.1.1.0/24, and show mpls forwarding-table vrf CUSTOMER 10.1.1.0/24. These three commands reveal the MPLS label assigned to a specific prefix in a VRF because each examines a different layer of the label-switching path: CEF detail shows the label in the forwarding entry, BGP displays the VPN label assigned by the control plane, and the MPLS forwarding table confirms the label used for actual packet forwarding. On the Cisco CCNP ENARSI 300-410 exam, this topic tests your ability to troubleshoot MPLS Layer 3 VPNs by verifying label propagation from the control plane to the data plane. A common trap is confusing show ip route vrf, which omits label information entirely, or show mpls ldp bindings, which requires additional filtering to isolate a VRF prefix. Remember the memory tip: “CEF, BGP, MPLS—three views, one label.”
300-410 MPLS L3VPN Practice Question
This 300-410 practice question tests your understanding of mpls l3vpn. 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.
Which THREE commands can be used to verify the MPLS label assigned to a specific prefix in a VRF on a PE router? (Choose THREE.)
Correct. This command displays the BGP table entry for the prefix, including the MPLS label.
B
show ip route vrf CUSTOMER 10.1.1.0/24
Why wrong: Incorrect. The IP routing table does not show MPLS labels; it shows next-hop and interface.
C
show mpls forwarding-table vrf CUSTOMER 10.1.1.0/24
Correct. This shows the LFIB entry for the prefix, including the outgoing label.
D
show ip cef vrf CUSTOMER 10.1.1.0/24 detail
Correct. The detailed CEF output includes the label stack for the prefix.
E
show mpls ldp bindings prefix 10.1.1.0/24
Why wrong: Incorrect. This command shows LDP bindings, but not in the context of a specific VRF; it may show labels but not the VRF-specific label assignment.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
show ip bgp vpnv4 vrf CUSTOMER 10.1.1.0/24
To check the MPLS label for a VRF prefix, an engineer can use 'show ip bgp vpnv4 vrf <name> <prefix>' to see the BGP label, 'show mpls forwarding-table vrf <name> <prefix>' to see the label used in forwarding, and 'show ip cef vrf <name> <prefix> detail' to see the label in the CEF entry. 'show ip route vrf' does not show MPLS labels. 'show mpls ldp bindings' shows local and remote label bindings, but not specifically for a VRF prefix without additional filtering.
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.
✓
show ip bgp vpnv4 vrf CUSTOMER 10.1.1.0/24
Why this is correct
Correct. This command displays the BGP table entry for the prefix, including the MPLS label.
Related concept
Read the scenario before looking for a memorised answer.
✗
show ip route vrf CUSTOMER 10.1.1.0/24
Why it's wrong here
Incorrect. The IP routing table does not show MPLS labels; it shows next-hop and interface.
✓
show mpls forwarding-table vrf CUSTOMER 10.1.1.0/24
Why this is correct
Correct. This shows the LFIB entry for the prefix, including the outgoing label.
Related concept
Read the scenario before looking for a memorised answer.
✓
show ip cef vrf CUSTOMER 10.1.1.0/24 detail
Why this is correct
Correct. The detailed CEF output includes the label stack for the prefix.
Related concept
Read the scenario before looking for a memorised answer.
✗
show mpls ldp bindings prefix 10.1.1.0/24
Why it's wrong here
Incorrect. This command shows LDP bindings, but not in the context of a specific VRF; it may show labels but not the VRF-specific label assignment.
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.
Trap categories for this question
Command / output trap
Incorrect. The IP routing table does not show MPLS labels; it shows next-hop and interface.
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 L3VPN — This question tests MPLS L3VPN — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: show ip bgp vpnv4 vrf CUSTOMER 10.1.1.0/24 — To check the MPLS label for a VRF prefix, an engineer can use 'show ip bgp vpnv4 vrf <name> <prefix>' to see the BGP label, 'show mpls forwarding-table vrf <name> <prefix>' to see the label used in forwarding, and 'show ip cef vrf <name> <prefix> detail' to see the label in the CEF entry. 'show ip route vrf' does not show MPLS labels. 'show mpls ldp bindings' shows local and remote label bindings, but not specifically for a VRF prefix without additional filtering.
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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