- A
Cloud Pub/Sub
Cloud Pub/Sub receives storage notifications and triggers the Cloud Function.
- B
Cloud Storage
Cloud Storage stores the images and provides event notifications.
- C
Cloud Tasks
Why wrong: Cloud Tasks is for task queuing, not needed here.
- D
Eventarc
Why wrong: Eventarc is used for event routing, but Cloud Storage triggers can be set up directly without it.
- E
Cloud Scheduler
Why wrong: Cloud Scheduler is for cron jobs, not event-driven triggers.
Question 244 of 999
Cloud Storage Events to Cloud Function — Pub/Sub Integration | Google Professional Cloud Developer Explained
This PCD practice question tests your understanding of integrating google cloud services. 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 developer is building a serverless application that processes user-uploaded images. The images are stored in Cloud Storage, and each upload should trigger a Cloud Function that performs image analysis and stores the result in Firestore. Which TWO Google Cloud services are essential for this integration? (Choose 2)
Quick Answer
The answer is Cloud Storage and Cloud Pub/Sub. Cloud Storage acts as the event source, generating notifications whenever a user uploads an image, while Cloud Pub/Sub decouples that event from the Cloud Function by reliably delivering the storage notification as a message. This serverless pattern is essential because Cloud Functions cannot directly subscribe to Cloud Storage bucket events without a messaging intermediary; Pub/Sub provides the asynchronous, durable channel that ensures every upload triggers the image analysis workflow. On the Google Professional Cloud Developer exam, this tests your understanding of event-driven architectures and the specific role of Pub/Sub as a notification endpoint for Cloud Storage, a common trap being to select Eventarc (which is an abstraction over Pub/Sub but not the core service required here) or Cloud Tasks (designed for scheduled or retry-based work, not real-time triggers). Remember the memory tip: “Bucket sends, Pub/Sub bends” — the bucket emits the event, and Pub/Sub bends the message to the Function.
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 Pub/Sub
Cloud Storage is the source of events (uploaded images). Cloud Pub/Sub is used to deliver notifications from Cloud Storage to the Cloud Function. Cloud Tasks, Cloud Scheduler, and Eventarc are not required for this pattern.
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.
- ✓
Cloud Pub/Sub
Why this is correct
Cloud Pub/Sub receives storage notifications and triggers the Cloud Function.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Cloud Storage
Why this is correct
Cloud Storage stores the images and provides event notifications.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Cloud Tasks
Why it's wrong here
Cloud Tasks is for task queuing, not needed here.
- ✗
Eventarc
Why it's wrong here
Eventarc is used for event routing, but Cloud Storage triggers can be set up directly without it.
- ✗
Cloud Scheduler
Why it's wrong here
Cloud Scheduler is for cron jobs, not event-driven triggers.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 PCD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
- →
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FAQ
Questions learners often ask
What does this PCD question test?
Integrating Google Cloud services — This question tests Integrating Google Cloud services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cloud Pub/Sub — Cloud Storage is the source of events (uploaded images). Cloud Pub/Sub is used to deliver notifications from Cloud Storage to the Cloud Function. Cloud Tasks, Cloud Scheduler, and Eventarc are not required for this pattern.
What should I do if I get this PCD question wrong?
Identify which PCD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Jun 24, 2026
This PCD 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 PCD exam.
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