- A
Set setgid bit on /opt/project and set umask to 007
Why wrong: This option sets the setgid bit correctly but uses umask 007. With umask 007, new files get permissions 660 and directories 770, which do include group write. However, it also removes all permissions for others (---). While this meets the requirement for group write, it is more restrictive than necessary. The key misconception is that umask 007 denies group write—it does not. The standard solution is umask 002 to allow others read/execute permissions.
- B
Set the sticky bit on /opt/project and umask to 022
Why wrong: Sticky bit affects deletion, not group inheritance; umask 022 gives group read only.
- C
Set umask for developers to 002 only
Why wrong: Without setgid, new files may be owned by the user's primary group, not 'devteam'.
- D
Set setgid bit on /opt/project and set umask for developers to 002
Setgid ensures group ownership inheritance; umask 002 ensures group write.
LFCS User and Group Management Practice Question
This LFCS practice question tests your understanding of user and group management. 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.
A team of developers must share files under /opt/project. All developers are members of the 'devteam' group. New files must be automatically assigned to group 'devteam' and be writable by the group. Which umask and setgid configuration should be applied?
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
Set setgid bit on /opt/project and set umask for developers to 002
Option D is correct because setting the setgid bit on /opt/project ensures that new files inherit the group ownership of the directory (devteam), and setting the umask to 002 removes write permission for others but preserves group write permission, so new files are group-writable. This combination meets both requirements automatically without manual intervention.
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.
- ✗
Set setgid bit on /opt/project and set umask to 007
Why it's wrong here
This option sets the setgid bit correctly but uses umask 007. With umask 007, new files get permissions 660 and directories 770, which do include group write. However, it also removes all permissions for others (---). While this meets the requirement for group write, it is more restrictive than necessary. The key misconception is that umask 007 denies group write—it does not. The standard solution is umask 002 to allow others read/execute permissions.
- ✗
Set the sticky bit on /opt/project and umask to 022
Why it's wrong here
Sticky bit affects deletion, not group inheritance; umask 022 gives group read only.
- ✗
Set umask for developers to 002 only
Why it's wrong here
Without setgid, new files may be owned by the user's primary group, not 'devteam'.
- ✓
Set setgid bit on /opt/project and set umask for developers to 002
Why this is correct
Setgid ensures group ownership inheritance; umask 002 ensures group write.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often make two mistakes regarding this question. First, they may think setting the setgid bit is sufficient without adjusting the umask; but without umask 002, the default 022 strips group write. Second, some may select umask 007 thinking it denies group write, but in reality umask 007 grants group write (660/770) while denying others, which is more restrictive than needed. The correct umask is 002.
Detailed technical explanation
How to think about this question
The setgid bit on a directory (chmod g+s) causes the kernel to set the group ID of new files to the directory's group ID, overriding the process's effective group. The umask is a per-process mask applied at file creation; a umask of 002 clears the 'other write' bit but preserves group write, so new files get mode 664 (rw-rw-r--) or 775 for directories. In practice, this is commonly used for shared project directories where multiple users need to collaborate without manually changing permissions.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
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.
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User and Group Management — study guide chapter
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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: Set setgid bit on /opt/project and set umask for developers to 002 — Option D is correct because setting the setgid bit on /opt/project ensures that new files inherit the group ownership of the directory (devteam), and setting the umask to 002 removes write permission for others but preserves group write permission, so new files are group-writable. This combination meets both requirements automatically without manual intervention.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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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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