XK0-006 System Management Practice Question
A system administrator runs the command 'chmod 4755 /usr/local/bin/backup'. What effect does this have on the file?
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
✓
Sets the SUID bit and gives rwxr-xr-x permissions
The 4 in the first digit sets the SUID bit, so the file runs with the owner's permissions. 755 sets rwxr-xr-x.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Sets the sticky bit and gives rwxr-xr-x permissions
Why it's wrong here
Sticky bit is 1xxx.
- ✓
Sets the SUID bit and gives rwxr-xr-x permissions
Why this is correct
SUID bit is set with 4xxx, permissions are 755.
- ✗
Sets the SGID bit and gives rwxr-xr-x permissions
Why it's wrong here
SGID is 2xxx, not 4xxx.
- ✗
Sets the SUID bit and gives rwxrwxr-x permissions
Why it's wrong here
755 gives rwxr-xr-x, not rwxrwxr-x.
Go deeper
Related to this question
Learn chapter
File Permissions and Ownership
Key term
chmod
chmod is a command in Linux and Unix-like operating systems used to change the permissions (read, write, execute) of a file or directory.
Key term
SUID
SUID (Set User ID) is a special file permission in Linux that allows a user to run an executable file with the file owner's privileges, typically root, rather than their own.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA 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 XK0-006 exam.