Quick Answer
The answer is to automatically configure LDP on the interface. When you apply the mpls ldp autoconfig command under an interface, it instructs the router to enable Label Distribution Protocol (LDP) on that interface as soon as MPLS is globally enabled on the device, without requiring the explicit mpls ip command. This streamlines deployment by ensuring that LDP sessions form automatically on the specified interfaces, but it does not enable LDP on all interfaces, nor does it disable LDP or enable MPLS forwarding on its own. On the Cisco SPCOR 350-501 exam, this command tests your understanding of MPLS control plane automation versus manual interface configuration; a common trap is confusing it with the global mpls ldp autoconfig command, which applies to all interfaces, or thinking it enables MPLS forwarding itself. Remember the memory tip: “Auto-config means LDP comes along for the ride when MPLS is globally enabled, but only on the interfaces you tell it to.”
This 350-501 practice question tests your understanding of architecture. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
What is the purpose of the 'mpls ldp autoconfig' command on an interface?
Enable MPLS forwarding
Why wrong: MPLS forwarding is enabled by 'mpls ip' command.
Enable LDP on all interfaces
Why wrong: It only enables on the specific interface, not all.
Disable LDP on the interface
Why wrong: This command enables, not disables LDP.
Automatically configure LDP on the interface
This command enables LDP automatically on the interface.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Automatically configure LDP on the interface
The 'mpls ldp autoconfig' command enables LDP on the interface automatically when MPLS is configured globally. It does not enable on all interfaces, nor disable LDP or enable MPLS forwarding.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Enable MPLS forwarding
Why it's wrong here
MPLS forwarding is enabled by 'mpls ip' command.
Enable LDP on all interfaces
Why it's wrong here
It only enables on the specific interface, not all.
Disable LDP on the interface
Why it's wrong here
This command enables, not disables LDP.
Automatically configure LDP on the interface
Why this is correct
This command enables LDP automatically on the interface.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
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
MPLS forwarding is enabled by 'mpls ip' command.
Detailed technical explanation
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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 — study guide chapter
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FAQ
Architecture — This question tests Architecture — Read the scenario before looking for a memorised answer..
The correct answer is: Automatically configure LDP on the interface — The 'mpls ldp autoconfig' command enables LDP on the interface automatically when MPLS is configured globally. It does not enable on all interfaces, nor disable LDP or enable MPLS forwarding.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.
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