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XK0-006 Practice Question: Based on the exhibit, why does the mv command…
Network Topology
Based on the exhibit, why does the mv command fail?
⚠ Common exam trap
CompTIA often tests the distinction between DAC (standard Linux permissions) and MAC (SELinux) by presenting a scenario where root appears to have permission but the command still fails, leading candidates to overlook SELinux and incorrectly blame filesystem mount options or directory permissions.
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
✓
SELinux is preventing the move due to file context mismatch.
SELinux enforces mandatory access controls that can prevent file operations even when standard Linux permissions (DAC) allow them. When moving a file from one directory to another, SELinux checks the file context of the source and the target directory; if the context of the file does not match the expected type for the target directory (e.g., moving a file with `unconfined_u:object_r:user_home_t` into `/etc` which expects `etc_t`), the move is denied. The `mv` command fails with a 'Permission denied' error, and the denial is logged in `/var/log/audit/audit.log`.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The user has exceeded the disk quota on the /etc partition.
Why it's wrong here
No quota error is shown.
- ✗
The /etc filesystem is mounted read-only.
Why it's wrong here
No indication of read-only mount; the error is about inter-device move.
- ✓
SELinux is preventing the move due to file context mismatch.
Why this is correct
SELinux enforcing mode and context mismatch cause denial.
- ✗
The /etc directory does not have write permissions for root.
Why it's wrong here
Root typically has write access to /etc; the error is SELinux-related.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
Go deeper
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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.