The correct answers are chmod and setfacl. chmod is the standard Linux command for modifying file permissions using symbolic or octal notation, directly altering the read, write, and execute bits for the owner, group, and others. setfacl extends this by modifying Access Control Lists (ACLs), which provide finer-grained control over permissions beyond the traditional three-tier model, allowing you to assign distinct permissions to specific users or groups. On the Systems Security Certified Practitioner SSCP exam, this distinction tests your understanding of both basic and advanced permission mechanisms; a common trap is assuming only chmod exists, while setfacl is essential for modern Linux security compliance. Remember the mnemonic: “chmod for the basics, setfacl for the specifics.”
SSCP Access Controls Practice Question
This SSCP practice question tests your understanding of access controls. 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.
Which two commands can be used to modify existing file permissions on a Linux system? (Select TWO)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
setfacl
B is correct because `setfacl` is used to modify Access Control Lists (ACLs) on a file or directory, which are an extended mechanism for setting permissions beyond the standard owner/group/others model. E is correct because `chmod` is the standard command for changing the read, write, and execute permissions for the file owner, group, and others using symbolic or octal notation.
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.
✗
chattr
Why it's wrong here
chattr changes file attributes (like immutable, append-only) on ext2/3/4 filesystems, not standard permissions.
✓
setfacl
Why this is correct
setfacl sets or modifies Access Control Lists (ACLs) that can define permissions for specific users or groups.
Related concept
Read the scenario before looking for a memorised answer.
✗
umask
Why it's wrong here
umask sets the default permission mask for newly created files; it does not affect existing files.
✗
chown
Why it's wrong here
chown changes the owner of a file, not the permissions directly.
✓
chmod
Why this is correct
chmod changes read, write, and execute permissions for owner, group, and others.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between commands that modify existing permissions (`chmod`, `setfacl`) versus commands that set defaults for new files (`umask`) or change file ownership (`chown`), leading candidates to mistakenly select `umask` or `chown` as tools for altering current permissions.
Detailed technical explanation
How to think about this question
Under the hood, `chmod` directly modifies the 12-bit permission field in the inode (9 bits for rwx for user/group/other, plus setuid, setgid, and sticky bit). `setfacl` modifies the extended ACL entries stored in the file's extended attributes, allowing fine-grained permissions for multiple specific users or groups beyond the traditional three-tier model. In a real-world scenario, a system administrator might use `setfacl` to grant a specific user read access to a log file without changing the group ownership or adding the user to a group.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
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.
Access Controls — This question tests Access Controls — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: setfacl — B is correct because `setfacl` is used to modify Access Control Lists (ACLs) on a file or directory, which are an extended mechanism for setting permissions beyond the standard owner/group/others model. E is correct because `chmod` is the standard command for changing the read, write, and execute permissions for the file owner, group, and others using symbolic or octal notation.
What should I do if I get this SSCP 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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This SSCP practice question is part of Courseiva's free ISC2 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 SSCP exam.
Question Discussion
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