The answer is Cloud Run. This is the correct choice because Cloud Run is a fully managed serverless platform that natively supports serverless container scaling to zero, meaning your containerized HTTP API will consume zero resources and incur no cost when idle, while automatically spinning up to handle incoming requests. On the Google Associate Cloud Engineer exam, this question tests your understanding of the key differentiator between serverless compute and managed Kubernetes: Cloud Run abstracts all cluster and server management away, whereas GKE Autopilot still requires you to manage a cluster and its nodes, even though it automates node provisioning. A common trap is confusing Autopilot’s “no node management” with “no cluster management”—Autopilot still gives you a Kubernetes cluster to oversee. For a quick memory tip, remember: “Cloud Run runs your code, not your cluster.”
Google ACE Planning and configuring a cloud solution Practice Question
This ACE practice question tests your understanding of planning and configuring 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 team needs to run a containerized HTTP API that scales to zero when idle and requires zero cluster or server management. Which GCP compute platform is the best fit?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cloud Run
Cloud Run is the best fit because it is a fully managed serverless platform that automatically scales your containerized HTTP API to zero when idle, meaning you pay only for resources used during request processing. It requires no cluster or server management, as it abstracts away the underlying infrastructure entirely, unlike other options that still involve some level of node or instance management.
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.
✗
Compute Engine with a managed instance group
Why it's wrong here
Managed instance groups require managing VMs, don't scale to zero, and always incur VM costs.
✗
Google Kubernetes Engine Autopilot
Why it's wrong here
GKE Autopilot manages nodes automatically but still requires a running cluster with associated costs — it doesn't scale to zero.
✓
Cloud Run
Why this is correct
Cloud Run is purpose-built for containerized HTTP services with zero-to-scale autoscaling, no infrastructure management, and per-request billing.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
App Engine Flexible
Why it's wrong here
App Engine Flexible runs on VMs and has a minimum of one instance always running — it doesn't scale to zero.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between 'scaling to zero' and 'scaling down to a minimum of one' — candidates mistakenly think GKE Autopilot or App Engine Flexible can scale to zero, but only Cloud Run (and Cloud Functions) natively supports true zero-instance scaling without additional configuration.
Detailed technical explanation
How to think about this question
Cloud Run uses Knative serving under the hood, which leverages Istio for networking and automatically provisions a TLS certificate via managed SSL for each revision. When idle, the revision's pod count drops to zero, and the first request after idle incurs a cold start latency (typically under 1 second for lightweight containers) as the platform pulls the container image and starts a new instance. This makes Cloud Run ideal for bursty, event-driven HTTP workloads where cost optimization is critical.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this ACE question in full detail.
Planning and configuring a cloud solution — This question tests Planning and configuring a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cloud Run — Cloud Run is the best fit because it is a fully managed serverless platform that automatically scales your containerized HTTP API to zero when idle, meaning you pay only for resources used during request processing. It requires no cluster or server management, as it abstracts away the underlying infrastructure entirely, unlike other options that still involve some level of node or instance management.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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