This LPIC-1 practice question tests your understanding of essential system services and networking. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 user reports that they cannot access the company's web server. The administrator confirms the server is running and network connectivity is fine. Which command should be used to verify that the HTTP service is listening on the correct port?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
ping 127.0.0.1
Why wrong: Tests loopback connectivity, not listening services.
netstat -rn
Why wrong: Shows routing table, not listening ports.
iperf3 -c localhost
Why wrong: Measures throughput, not listening status.
ss -tlnp
Shows listening TCP sockets with port and process.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ss -tlnp
Option B is correct because ss -tlnp shows listening TCP sockets with port numbers and process names. Option A is wrong because it shows routing table. Option C is wrong because it tests connectivity, not listening sockets. Option D is wrong because it shows network statistics, not listening ports.
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.
ping 127.0.0.1
Why it's wrong here
Tests loopback connectivity, not listening services.
netstat -rn
Why it's wrong here
Shows routing table, not listening ports.
iperf3 -c localhost
Why it's wrong here
Measures throughput, not listening status.
ss -tlnp
Why this is correct
Shows listening TCP sockets with port and process.
Clue confirmation
The clue word "which command" in the question point toward this answer.
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
Shows routing table, not listening ports.
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 LPIC-1 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 LPIC-1 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.
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FAQ
Essential System Services and Networking — This question tests Essential System Services and Networking — Read the scenario before looking for a memorised answer..
The correct answer is: ss -tlnp — Option B is correct because ss -tlnp shows listening TCP sockets with port numbers and process names. Option A is wrong because it shows routing table. Option C is wrong because it tests connectivity, not listening sockets. Option D is wrong because it shows network statistics, not listening ports.
Identify which LPIC-1 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.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This LPIC-1 practice question is part of Courseiva's free LPI 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 LPIC-1 exam.
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