- A
userdel temp_audit
Why wrong: Deletes the user entirely, which is more drastic than locking.
- B
usermod -L temp_audit
Locks the account by prepending '!' to the encrypted password.
- C
chage -E 0 temp_audit
Why wrong: Sets account expiration to past date, which disables the account, but does not lock it; user still could use SSH keys if configured.
- D
passwd -u temp_audit
Why wrong: -u unlocks, not locks.
Question 181 of 513
LFCS User and Group Management Practice Question
This LFCS practice question tests your understanding of user and group management. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 security policy requires that a user account 'temp_audit' be locked immediately without changing the password. Which command locks the account and prevents login?
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.
Clue:
"immediately / without restart"Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
usermod -L temp_audit
The `usermod -L` command locks a user account by placing an exclamation mark (!) at the beginning of the password hash in /etc/shadow, effectively disabling password-based authentication without altering the existing password. This satisfies the security policy requirement to immediately prevent login without changing the password.
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.
- ✗
userdel temp_audit
Why it's wrong here
Deletes the user entirely, which is more drastic than locking.
- ✓
usermod -L temp_audit
Why this is correct
Locks the account by prepending '!' to the encrypted password.
Clue confirmation
The clue words "which command", "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
chage -E 0 temp_audit
Why it's wrong here
Sets account expiration to past date, which disables the account, but does not lock it; user still could use SSH keys if configured.
- ✗
passwd -u temp_audit
Why it's wrong here
-u unlocks, not locks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing `usermod -L` with `passwd -l` (which also locks the account) or mistaking `chage -E 0` for an immediate lock, when in fact `chage` sets a future expiration date and does not prevent all authentication methods like SSH keys or sudo.
Detailed technical explanation
How to think about this question
Under the hood, `usermod -L` modifies the second field of /etc/shadow by prepending a '!' to the encrypted password hash, making it an invalid hash that cannot match any password. This lock persists even if the password is later changed, unless explicitly unlocked with `usermod -U`. In real-world scenarios, this is preferred over `passwd -l` because it works consistently across different PAM configurations and does not require root to know the current password.
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.
TExam Day Tips
- 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 LFCS 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
User and Group Management — study guide chapter
Learn the concepts, then practise the questions
- →
User and Group Management practice questions
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FAQ
Questions learners often ask
What does this LFCS question test?
User and Group Management — This question tests User and Group Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: usermod -L temp_audit — The `usermod -L` command locks a user account by placing an exclamation mark (!) at the beginning of the password hash in /etc/shadow, effectively disabling password-based authentication without altering the existing password. This satisfies the security policy requirement to immediately prevent login without changing the password.
What should I do if I get this LFCS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "which command", "immediately / without restart". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This LFCS practice question is part of Courseiva's free Linux Foundation 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 LFCS exam.
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