- A
Enable GKE Node Auto-Repair to automatically fix the issue.
Why wrong: Node Auto-Repair handles health issues, not machine type changes.
- B
Delete the existing node pool and create a new one with the new machine type.
Why wrong: This would cause downtime as workloads are deleted.
- C
Update the existing node pool's machine type via gcloud container node-pools update.
Why wrong: Machine type cannot be updated on an existing node pool; a new pool must be created.
- D
Create a new node pool with the new machine type, cordon and drain old nodes, then delete the old pool.
Correct. This approach migrates workloads gracefully.
- E
Use gcloud compute machine-types change on the nodes.
Why wrong: Compute Engine machine types cannot be changed on running instances that are part of a managed group.
Google PCA Manage and provision cloud infrastructure Practice Question
This PCA practice question tests your understanding of manage and provision cloud infrastructure. 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.
A company has a production GKE cluster with a node pool using n1-standard-4 machine types. They need to change to e2-standard-4 without downtime. Which approach should be taken?
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
Create a new node pool with the new machine type, cordon and drain old nodes, then delete the old pool.
Option D is correct because it ensures zero downtime by first creating a new node pool with the desired e2-standard-4 machine type, then cordoning and draining the old nodes to gracefully migrate workloads, and finally deleting the old pool. This approach leverages Kubernetes' native pod eviction and rescheduling mechanisms to maintain application availability throughout the migration.
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.
- ✗
Enable GKE Node Auto-Repair to automatically fix the issue.
Why it's wrong here
Node Auto-Repair handles health issues, not machine type changes.
- ✗
Delete the existing node pool and create a new one with the new machine type.
Why it's wrong here
This would cause downtime as workloads are deleted.
- ✗
Update the existing node pool's machine type via gcloud container node-pools update.
Why it's wrong here
Machine type cannot be updated on an existing node pool; a new pool must be created.
- ✓
Create a new node pool with the new machine type, cordon and drain old nodes, then delete the old pool.
Why this is correct
Correct. This approach migrates workloads gracefully.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use gcloud compute machine-types change on the nodes.
Why it's wrong here
Compute Engine machine types cannot be changed on running instances that are part of a managed group.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that you can update an existing node pool's machine type via a simple command, but in GKE, machine type is immutable after creation, requiring a new pool and graceful migration.
Detailed technical explanation
How to think about this question
Under the hood, when you cordon a node, it is marked as unschedulable, and draining evicts pods using the Eviction API, respecting PodDisruptionBudgets to maintain quorum. GKE then automatically reschedules the evicted pods onto the new e2-standard-4 nodes. This process is critical in production environments where even brief downtime can violate SLAs, such as during a planned migration to a more cost-efficient machine series.
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
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.
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FAQ
Questions learners often ask
What does this PCA question test?
Manage and provision cloud infrastructure — This question tests Manage and provision cloud infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a new node pool with the new machine type, cordon and drain old nodes, then delete the old pool. — Option D is correct because it ensures zero downtime by first creating a new node pool with the desired e2-standard-4 machine type, then cordoning and draining the old nodes to gracefully migrate workloads, and finally deleting the old pool. This approach leverages Kubernetes' native pod eviction and rescheduling mechanisms to maintain application availability throughout the migration.
What should I do if I get this PCA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This PCA 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 PCA exam.
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