- A
GKE terminates all nodes simultaneously and creates new ones — brief downtime occurs.
Why wrong: max-unavailable: 0 prevents any node from being taken offline before a replacement is ready. Simultaneous termination would only occur with max-unavailable set to the full node count.
- B
GKE provisions one new node, drains one old node, deletes it, and repeats — zero downtime.
max-surge: 1 provisions one extra node. max-unavailable: 0 ensures old nodes are drained (pods rescheduled) before removal. The process repeats node by node with no pod disruption.
- C
GKE upgrades nodes in-place by applying a kernel patch without rescheduling pods.
Why wrong: GKE does not patch nodes in-place. Node upgrades replace nodes with new images — pods are rescheduled to the replacement nodes.
- D
Two nodes are upgraded simultaneously (one being the surge node and one old node going offline).
Why wrong: max-surge: 1 adds one node. max-unavailable: 0 means zero old nodes go offline until the surge node is ready to receive pods. It's a sequential one-at-a-time replacement, not simultaneous.
Quick Answer
The answer is that GKE provisions one new node, drains one old node, deletes it, and repeats, achieving zero downtime. This is correct because the surge upgrade configuration `max-surge: 1, max-unavailable: 0` forces GKE to first spin up a new node (the surge node) before touching any existing node, ensuring the cluster’s total capacity never drops below the desired count. The `max-unavailable: 0` setting guarantees that no running workloads are disrupted, as old pods are gracefully evicted only after the new node is ready. On the Google Associate Cloud Engineer exam, this scenario tests your understanding of how surge upgrades maintain availability during node image updates—a common trap is confusing `max-surge` with `max-unavailable` or assuming nodes are upgraded in place. Remember the memory tip: “Surge first, then drain—zero pain.”
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. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Your GKE cluster nodes are running an older kernel version with a known vulnerability. You need to update all nodes to use the latest node image with the patched kernel without any downtime. The cluster has a Surge Upgrade configuration of `max-surge: 1, max-unavailable: 0`. What happens during the node upgrade?
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
GKE provisions one new node, drains one old node, deletes it, and repeats — zero downtime.
Option B is correct because the surge upgrade configuration `max-surge: 1, max-unavailable: 0` ensures that GKE first provisions one new node (the surge node) before draining and deleting an old node. This rolling update process maintains the desired capacity at all times, resulting in zero downtime for applications.
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.
- ✗
GKE terminates all nodes simultaneously and creates new ones — brief downtime occurs.
Why it's wrong here
max-unavailable: 0 prevents any node from being taken offline before a replacement is ready. Simultaneous termination would only occur with max-unavailable set to the full node count.
- ✓
GKE provisions one new node, drains one old node, deletes it, and repeats — zero downtime.
Why this is correct
max-surge: 1 provisions one extra node. max-unavailable: 0 ensures old nodes are drained (pods rescheduled) before removal. The process repeats node by node with no pod disruption.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
GKE upgrades nodes in-place by applying a kernel patch without rescheduling pods.
Why it's wrong here
GKE does not patch nodes in-place. Node upgrades replace nodes with new images — pods are rescheduled to the replacement nodes.
- ✗
Two nodes are upgraded simultaneously (one being the surge node and one old node going offline).
Why it's wrong here
max-surge: 1 adds one node. max-unavailable: 0 means zero old nodes go offline until the surge node is ready to receive pods. It's a sequential one-at-a-time replacement, not simultaneous.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that `max-surge` and `max-unavailable` control the number of nodes upgraded simultaneously, when in fact `max-surge` controls the extra nodes provisioned and `max-unavailable` controls how many nodes can be unavailable at any time, and candidates confuse this with parallel upgrades.
Detailed technical explanation
How to think about this question
Under the hood, GKE uses a rolling update mechanism where the node pool's upgrade controller first creates a new node with the latest image, then cordons and drains pods from an old node using the Kubernetes API (via `kubectl drain` with `--ignore-daemonsets` and `--delete-emptydir-data`). The `max-surge: 1` parameter allows one extra node beyond the desired count, while `max-unavailable: 0` ensures that the total number of available nodes never drops below the original count, which is critical for stateful workloads or clusters with strict PodDisruptionBudgets.
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.
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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: GKE provisions one new node, drains one old node, deletes it, and repeats — zero downtime. — Option B is correct because the surge upgrade configuration `max-surge: 1, max-unavailable: 0` ensures that GKE first provisions one new node (the surge node) before draining and deleting an old node. This rolling update process maintains the desired capacity at all times, resulting in zero downtime for applications.
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.
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 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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