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.
Refer to the exhibit. What is the primary group ID of user 'charlie'?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
1000
Why wrong: Not present; GID is 1005.
Charlie Brown
Why wrong: That is the GECOS comment.
1005 (the same as UID)
Correct. '1005 (the same as UID)' accurately describes the primary group ID and its default relationship to the UID.
1005
Correct. '1005' is the exact numeric GID of the primary group for user 'charlie'.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
1005 (the same as UID)
The primary group ID for user 'charlie' is 1005. By default, Linux creates a private user group for each new user with a GID equal to the user's UID. Both option C, which adds explanatory context, and option D, which provides the numeric value alone, are factually correct. Therefore, both are acceptable answers.
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.
1000
Why it's wrong here
Not present; GID is 1005.
Charlie Brown
Why it's wrong here
That is the GECOS comment.
1005 (the same as UID)
Why this is correct
Correct. '1005 (the same as UID)' accurately describes the primary group ID and its default relationship to the UID.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
1005
Why this is correct
Correct. '1005' is the exact numeric GID of the primary group for user 'charlie'.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often assume the primary group ID is always different from the UID or that it is the same as the user's full name (GECOS field), but the LFCS exam expects you to know that by default, Linux creates a private group with a GID matching the UID, making '1005 (the same as UID)' the most accurate answer.
Detailed technical explanation
Under the hood, the `useradd` command reads the `USERGROUPS_ENAB` setting in `/etc/login.defs`; when set to 'yes' (the default on most modern distributions), it creates a private group with a GID equal to the new user's UID. This behavior is defined by the User Private Group (UPG) scheme, which simplifies permission management by ensuring each user has a unique group for file ownership. In a real-world scenario, if an administrator manually changes the primary group with `usermod -g`, the GID can differ from the UID, which is a common cause of permission issues in multi-user environments.
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 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
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FAQ
User and Group Management — This question tests User and Group Management — Read the scenario before looking for a memorised answer..
The correct answer is: 1005 (the same as UID) — The primary group ID for user 'charlie' is 1005. By default, Linux creates a private user group for each new user with a GID equal to the user's UID. Both option C, which adds explanatory context, and option D, which provides the numeric value alone, are factually correct. Therefore, both are acceptable answers.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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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