XK0-006 System Management Practice Question
A system administrator needs to set the umask so that newly created files have permissions of 644 and directories have permissions of 755. Which umask value should be set?
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
✓
0022
Default base permissions are 666 for files and 777 for directories. To get 644 (rw-r--r--) for files: 666 - 644 = 022. To get 755 (rwxr-xr-x) for directories: 777 - 755 = 022. So umask 022 works for both.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
0222
Why it's wrong here
0222 would remove write for all, resulting in 444 for files (r--r--r--), not desired.
- ✓
0022
Why this is correct
Correct: umask 022 subtracts group and others write permission, resulting in 644 for files and 755 for directories.
- ✗
000
Why it's wrong here
000 would result in 666 for files and 777 for directories, which is too permissive.
- ✗
077
Why it's wrong here
077 would remove all permissions for group and others, resulting in 600 for files and 700 for directories.
Go deeper
Related to this question
Learn chapter
File Permissions and Ownership
Key term
umask
Umask (user file-creation mode mask) is a Linux/Unix setting that determines the default permissions assigned to new files and directories by subtracting or masking permission bits from a base set.
Key term
Value
Value is the perceived worth, benefit, or usefulness that a service, product, or activity delivers to stakeholders, especially customers and the business.
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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.