- A
Upgrade node pools first, then upgrade the control plane
Why wrong: GKE requires the control plane to be upgraded before node pools — nodes cannot run a newer version than the control plane.
- B
Upgrade the control plane to 1.28 first, then 1.29; then upgrade node pools incrementally, respecting the PDB
GKE requires incremental minor version upgrades (1.27→1.28→1.29). The control plane upgrades first, then nodes are drained one at a time respecting the PodDisruptionBudget.
- C
Delete and recreate the cluster at version 1.29 to skip incremental upgrades
Why wrong: Recreating the cluster loses all running workloads and state — it's not the appropriate approach for upgrading production clusters.
- D
Upgrade control plane directly from 1.27 to 1.29, then upgrade node pools
Why wrong: GKE does not support skipping minor versions — the upgrade path is 1.27→1.28→1.29 for both control plane and node pools.
Quick Answer
The correct upgrade sequence is to upgrade the control plane one minor version at a time—from 1.27 to 1.28, then to 1.29—before upgrading the node pools incrementally while respecting the PodDisruptionBudget (PDB). This order is mandatory because Kubernetes enforces strict version skew policies: the control plane must always be at a higher or equal minor version than the nodes, and skipping minor versions (e.g., 1.27 to 1.29) would break API compatibility and risk cluster instability. On the Google Associate Cloud Engineer exam, this scenario tests your understanding of both the GKE upgrade sequence and how PDBs protect stateful workloads during node pool upgrades. A common trap is attempting to upgrade the control plane and node pools simultaneously, or skipping a minor version, which the exam explicitly penalizes. Remember the mnemonic: “Plane first, pools second, one step at a time—PDB keeps your pods in line.”
Google ACE Practice Question: Ensuring successful operation of a cloud solution
This ACE practice question tests your understanding of ensuring successful operation of 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.
A GKE cluster running Kubernetes 1.27 needs to be upgraded to 1.29. The cluster has a stateful workload with a PodDisruptionBudget requiring at least 2 out of 3 replicas running at all times. What is the correct upgrade sequence?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"least"Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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
Upgrade the control plane to 1.28 first, then 1.29; then upgrade node pools incrementally, respecting the PDB
Option B is correct because Kubernetes requires that the control plane be upgraded one minor version at a time (e.g., 1.27 → 1.28 → 1.29) to maintain API compatibility and stability. After the control plane is upgraded, node pools can be upgraded incrementally, and the PodDisruptionBudget (PDB) ensures that during node upgrades, at least 2 out of 3 replicas remain available, preventing workload disruption.
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.
- ✗
Upgrade node pools first, then upgrade the control plane
Why it's wrong here
GKE requires the control plane to be upgraded before node pools — nodes cannot run a newer version than the control plane.
- ✓
Upgrade the control plane to 1.28 first, then 1.29; then upgrade node pools incrementally, respecting the PDB
Why this is correct
GKE requires incremental minor version upgrades (1.27→1.28→1.29). The control plane upgrades first, then nodes are drained one at a time respecting the PodDisruptionBudget.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Delete and recreate the cluster at version 1.29 to skip incremental upgrades
Why it's wrong here
Recreating the cluster loses all running workloads and state — it's not the appropriate approach for upgrading production clusters.
- ✗
Upgrade control plane directly from 1.27 to 1.29, then upgrade node pools
Why it's wrong here
GKE does not support skipping minor versions — the upgrade path is 1.27→1.28→1.29 for both control plane and node pools.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think node pools can be upgraded first (Option A) or that skipping minor versions is acceptable (Option D), but Cisco tests the strict Kubernetes version skew policy and the requirement for sequential control plane upgrades, especially when a PDB is in play.
Detailed technical explanation
How to think about this question
Kubernetes version skew policy (as of v1.28) allows nodes to be up to two minor versions older than the control plane, but the control plane itself must be upgraded one minor version at a time. The PodDisruptionBudget (PDB) uses a selector and `minAvailable` (or `maxUnavailable`) to enforce availability constraints during voluntary disruptions like node upgrades, and the cluster autoscaler or node pool upgrade controller will respect the PDB by draining nodes one at a time. In GKE, the control plane upgrade is managed by Google and typically completes within minutes, while node pool upgrades can be performed via `gcloud container clusters upgrade` with the `--node-pool` flag.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
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Ensuring successful operation of a cloud solution — study guide chapter
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FAQ
Questions learners often ask
What does this ACE question test?
Ensuring successful operation of a cloud solution — This question tests Ensuring successful operation of a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Upgrade the control plane to 1.28 first, then 1.29; then upgrade node pools incrementally, respecting the PDB — Option B is correct because Kubernetes requires that the control plane be upgraded one minor version at a time (e.g., 1.27 → 1.28 → 1.29) to maintain API compatibility and stability. After the control plane is upgraded, node pools can be upgraded incrementally, and the PodDisruptionBudget (PDB) ensures that during node upgrades, at least 2 out of 3 replicas remain available, preventing workload disruption.
What should I do if I get this ACE 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: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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: Jun 11, 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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