This LFCS practice question tests your understanding of user and group management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
An administrator runs 'pwck' and receives an error indicating a user in /etc/passwd has no matching group in /etc/group. What is the most likely cause and the appropriate corrective action?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The user's GID in /etc/passwd is invalid; use usermod -g to set a valid group.
Option D is correct: the user may belong to a group that was removed; the admin should assign an existing group. Option A is wrong because groupdel does not automatically modify /etc/passwd. Option B is backwards. Option C is incomplete; verifying password hashes is not directly related.
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.
✓
The user's GID in /etc/passwd is invalid; use usermod -g to set a valid group.
Why this is correct
Correct: usermod -g can change the primary group to an existing one.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The user's secondary group in /etc/group is missing; add the user back to the group.
Why it's wrong here
The error is about primary group, not secondary.
✗
The group was deleted with groupdel but the user's primary group in /etc/passwd was not updated; recreate the group.
Why it's wrong here
Recreating the group may not be desired; better to assign another existing group.
✗
The user's password hash is corrupted; run 'pwconv' to synchronize.
Why it's wrong here
This is about group mismatch, not password hashes.
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 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 LFCS 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.
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: The user's GID in /etc/passwd is invalid; use usermod -g to set a valid group. — Option D is correct: the user may belong to a group that was removed; the admin should assign an existing group. Option A is wrong because groupdel does not automatically modify /etc/passwd. Option B is backwards. Option C is incomplete; verifying password hashes is not directly related.
What should I do if I get this LFCS question wrong?
Identify which LFCS 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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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