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CV0-004 Practice Question: A containerized application deployment fails with…
A containerized application deployment fails with an 'ImagePullBackOff' error. What should the administrator verify?
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
✓
The container registry credentials and image tag
The 'ImagePullBackOff' error indicates that the container runtime is unable to pull the specified image from the registry. This is commonly caused by an incorrect image tag (e.g., typo or non-existent tag) or invalid registry credentials. Therefore, the administrator should verify the container registry credentials and image tag (Option D). Option A is incorrect because CPU utilization does not cause image pull failures. Option B is incorrect: while DNS misconfiguration can cause name resolution errors, it typically results in a 'ErrImagePull' or 'ImagePullBackOff' with a different underlying cause, but the most common and direct issue is with the image specification itself or authentication. Option C is incorrect because firewall rules would cause timeouts or connection refused errors, not the specific 'ImagePullBackOff' which indicates the image pull was attempted but failed due to credentials or image name.
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 CPU utilization on the node
Why it's wrong here
CPU utilization does not affect image pulling, except in extreme resource starvation.
- ✗
The cluster's DNS configuration
Why it's wrong here
DNS issues would likely show 'DNS lookup failed' error.
- ✗
The firewall rules between nodes and registry
Why it's wrong here
Firewall blocks would cause connection timeouts, not ImagePullBackOff.
- ✓
The container registry credentials and image tag
Why this is correct
ImagePullBackOff commonly occurs when the image is not found or access is denied.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 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 CV0-004 exam.