Question 197 of 507
LPIC-2 System Security Practice Question
Exhibit
Refer to the exhibit. # getfacl /var/www/html/index.html # file: var/www/html/index.html # owner: root # group: www-data user::rw- user:www-data:r-- group::r-- mask::r-- other::---
Based on the ACL output, which user(s) can write to the file /var/www/html/index.html?
⚠ Common exam trap
The trap here is that candidates often overlook that the ACL mask applies only to named users and groups, not to root, leading them to incorrectly believe that the mask r-- blocks all write access, including root's.
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
✓
Only root.
The ACL output shows that the mask is set to r--, which limits the effective permissions of named users and groups to read-only, regardless of their ACL entries. However, the root user is not subject to ACL restrictions and always has full access to any file, including write permission, making root the only user who can write to the file.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Only the user www-data.
Why it's wrong here
www-data has read-only permission.
- ✗
No one, because the mask is r--.
Why it's wrong here
Mask does not affect root's permissions.
- ✓
Only root.
Why this is correct
Root has rw- and is not limited by mask.
- ✗
Any user in the www-data group.
Why it's wrong here
Group has r--.
Visual reference
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Last reviewed: Jun 11, 2026
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