This CV0-004 practice question tests your understanding of deployment. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Refer to the exhibit.
```bash
$ kubectl rollout status deployment/myapp
Waiting for deployment "myapp" rollout to finish: 0 of 3 updated replicas are available...
Error: deployment "myapp" exceeded its progress deadline
```
A DevOps engineer runs a rollout status command for a Kubernetes deployment and receives the error shown. The deployment specification includes a rolling update strategy with maxSurge=25% and maxUnavailable=25%. What is the most likely cause of the failure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Refer to the exhibit.
```bash
$ kubectl rollout status deployment/myapp
Waiting for deployment "myapp" rollout to finish: 0 of 3 updated replicas are available...
Error: deployment "myapp" exceeded its progress deadline
```
A
The cluster does not have enough CPU resources to schedule new pods
Why wrong: Resource constraints would prevent scheduling, not cause progress deadline.
B
The new pod template contains an invalid container image tag
Invalid image causes pods to fail readiness, leading to rollout timeout.
C
The maxSurge and maxUnavailable settings are too restrictive
Why wrong: Those settings allow the rollout; they don't cause the deadline error.
D
The old ReplicaSet is still running and preventing the new one from scaling up
Why wrong: Old ReplicaSet is scaled down as new pods become ready.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The new pod template contains an invalid container image tag
The error message from the rollout status command indicates that the new ReplicaSet is unable to create pods, which typically occurs when the pod template in the deployment specification references an invalid container image tag. Kubernetes attempts to pull the image, fails, and marks the pods as ImagePullBackOff or ErrImagePull, preventing the rollout from progressing. The rolling update strategy with maxSurge=25% and maxUnavailable=25% is not the cause, as these settings control the rate of pod replacement, not the validity of the image reference.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 cluster does not have enough CPU resources to schedule new pods
Why it's wrong here
Resource constraints would prevent scheduling, not cause progress deadline.
✓
The new pod template contains an invalid container image tag
Why this is correct
Invalid image causes pods to fail readiness, leading to rollout timeout.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The maxSurge and maxUnavailable settings are too restrictive
Why it's wrong here
Those settings allow the rollout; they don't cause the deadline error.
✗
The old ReplicaSet is still running and preventing the new one from scaling up
Why it's wrong here
Old ReplicaSet is scaled down as new pods become ready.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between resource constraints (which cause Pending pods) and image-related errors (which cause ImagePullBackOff), tempting candidates to choose CPU or memory issues when the error message points to a pod template problem.
Detailed technical explanation
How to think about this question
When a deployment rollout fails due to an invalid image tag, Kubernetes sets the pod status to ErrImagePull or ImagePullBackOff, which is visible via `kubectl describe pods` or `kubectl get events`. The rollout status command reports a failure because the new ReplicaSet's pods never reach the Running state, causing the deployment controller to halt the update. In real-world scenarios, this often happens when a developer mistypes a tag (e.g., 'latestt' instead of 'latest') or references a private registry without proper imagePullSecrets.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CV0-004 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The new pod template contains an invalid container image tag — The error message from the rollout status command indicates that the new ReplicaSet is unable to create pods, which typically occurs when the pod template in the deployment specification references an invalid container image tag. Kubernetes attempts to pull the image, fails, and marks the pods as ImagePullBackOff or ErrImagePull, preventing the rollout from progressing. The rolling update strategy with maxSurge=25% and maxUnavailable=25% is not the cause, as these settings control the rate of pod replacement, not the validity of the image reference.
What should I do if I get this CV0-004 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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