- A
Google Kubernetes Engine
Why wrong: GKE is not serverless and requires managing infrastructure to handle events.
- B
Cloud Run for Anthos
Why wrong: Cloud Run for Anthos requires a GKE cluster and is not directly triggered by Cloud Storage events.
- C
Compute Engine with autoscaling
Why wrong: Compute Engine is not serverless and requires manual setup for event-driven processing.
- D
Cloud Functions
Cloud Functions natively supports Cloud Storage triggers and auto-scales for bursts.
Question 585 of 1,000
Google PCA Practice Question: Designing and Planning a Cloud Solution Architecture
This PCA practice question tests your understanding of designing and planning a cloud solution architecture. 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 wants to implement an event-driven architecture where uploads to a Cloud Storage bucket trigger processing in a serverless function. The function must process each object within a few seconds and handle bursts of thousands of uploads. Which service should they use?
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
✓
Cloud Functions
Cloud Functions is the correct choice because it is a fully managed, event-driven serverless compute service that natively triggers on Cloud Storage bucket events (e.g., object finalize/create). It automatically scales from zero to thousands of concurrent invocations within seconds, meeting the burst requirement, and has a maximum timeout of 9 minutes (well above the 'few seconds' requirement).
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.
- ✗
Google Kubernetes Engine
Why it's wrong here
GKE is not serverless and requires managing infrastructure to handle events.
- ✗
Cloud Run for Anthos
Why it's wrong here
Cloud Run for Anthos requires a GKE cluster and is not directly triggered by Cloud Storage events.
- ✗
Compute Engine with autoscaling
Why it's wrong here
Compute Engine is not serverless and requires manual setup for event-driven processing.
- ✓
Cloud Functions
Why this is correct
Cloud Functions natively supports Cloud Storage triggers and auto-scales for bursts.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often mistakenly think that container-based or VM-based services like GKE, Cloud Run for Anthos, or Compute Engine can handle event-driven bursts as efficiently as Cloud Functions, ignoring the cold-start latency and management overhead.
Detailed technical explanation
How to think about this question
Under the hood, Cloud Functions uses a gRPC-based invocation pipeline where Cloud Storage publishes object change notifications to a Pub/Sub topic, which then triggers the function via a push subscription. The function runtime (e.g., Node.js, Python) is pre-warmed in a sandboxed environment, and concurrent requests are handled by spawning new instances up to a configurable maximum (default 3000 per region). A real-world scenario: a photo-sharing app uploading 10,000 images in one minute would trigger 10,000 function invocations, each processing within 2 seconds, with no cold-start penalty for the burst because Cloud Functions keeps a pool of idle instances.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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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Designing and Planning a Cloud Solution Architecture — study guide chapter
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FAQ
Questions learners often ask
What does this PCA question test?
Designing and Planning a Cloud Solution Architecture — This question tests Designing and Planning a Cloud Solution Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cloud Functions — Cloud Functions is the correct choice because it is a fully managed, event-driven serverless compute service that natively triggers on Cloud Storage bucket events (e.g., object finalize/create). It automatically scales from zero to thousands of concurrent invocations within seconds, meeting the burst requirement, and has a maximum timeout of 9 minutes (well above the 'few seconds' requirement).
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 2026
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