- A
Scale the deployment to zero and then scale back up
Why wrong: Does not change the version running.
- B
Run kubectl delete deployment and re-apply the old manifest
Why wrong: This deletes all pods, causing downtime; also requires having the old manifest.
- C
Run kubectl rollout undo deployment/<deployment-name>
Rolls back to the previous revision with minimal downtime.
- D
Run kubectl rollout history deployment/<deployment-name>
Why wrong: Only shows revision history, does not roll back.
Question 975 of 1,000
Google ACE Deploying and Implementing a Cloud Solution Practice Question
This ACE practice question tests your understanding of deploying and implementing a cloud solution. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
An engineer deployed a new version of their application on GKE using a Deployment. Users report that the new version has a bug. The engineer wants to quickly revert to the previous version. How can they achieve this?
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
✓
Run kubectl rollout undo deployment/<deployment-name>
Kubernetes Deployments support rollbacks using 'kubectl rollout undo'. The command automatically reverts to the previous revision. Deleting and recreating the Deployment would require re-creating from the previous manifest. 'kubectl rollout history' shows history but doesn't roll back. Scaling down then up does not revert the version.
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.
- ✗
Scale the deployment to zero and then scale back up
Why it's wrong here
Does not change the version running.
- ✗
Run kubectl delete deployment and re-apply the old manifest
Why it's wrong here
This deletes all pods, causing downtime; also requires having the old manifest.
- ✓
Run kubectl rollout undo deployment/<deployment-name>
Why this is correct
Rolls back to the previous revision with minimal downtime.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Run kubectl rollout history deployment/<deployment-name>
Why it's wrong here
Only shows revision history, does not roll back.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
Only shows revision history, does not roll back.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which ACE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Deploying and Implementing a Cloud Solution — study guide chapter
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FAQ
Questions learners often ask
What does this ACE question test?
Deploying and Implementing a Cloud Solution — This question tests Deploying and Implementing a Cloud Solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Run kubectl rollout undo deployment/<deployment-name> — Kubernetes Deployments support rollbacks using 'kubectl rollout undo'. The command automatically reverts to the previous revision. Deleting and recreating the Deployment would require re-creating from the previous manifest. 'kubectl rollout history' shows history but doesn't roll back. Scaling down then up does not revert the version.
What should I do if I get this ACE question wrong?
Identify which ACE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This ACE practice question is part of Courseiva's free Google Cloud 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 ACE exam.
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