PDE Ingesting and Processing the Data Practice Question
A company wants to use Eventarc to trigger a Cloud Run service when new objects are created in a GCS bucket. They also need to filter events for a specific bucket and object prefix. Which THREE resources must exist or be created?
⚠ Common exam trap
PDE often tests the misconception that you must manually create a Pub/Sub topic for Eventarc — Eventarc handles it automatically, so it's not a required resource.
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 Storage bucket
Option A (Cloud Storage bucket) is correct because Eventarc's Cloud Storage events originate from an actual GCS bucket, and the trigger's bucket filter must reference that existing bucket where objects are created. Option D (Eventarc trigger) is correct because the trigger is the resource that connects the event source to the destination, defines the event type (e.g., google.cloud.storage.object.v1.finalized), and applies the bucket and object-prefix attribute filters. Option E (Cloud Run service) is correct because it is the event destination that Eventarc invokes when a matching object-creation event fires. Option B (Pub/Sub topic) is not required because Eventarc manages its own internal Pub/Sub transport for Cloud Storage events; you do not create or specify a topic. Option C (Cloud Scheduler job) is not required because scheduling is unrelated to event-driven object-creation triggers.
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 Storage bucket
Why this is correct
The Cloud Storage bucket is the event source whose object-creation notifications Eventarc consumes. It must exist before any trigger can target it, satisfying the scenario's requirement to react to new objects, and its name forms part of the trigger's filtering criteria.
- ✗
Pub/Sub topic
Why it's wrong here
Eventarc delivers events by publishing them to a Pub/Sub topic, but the topic is created automatically by Eventarc; it is not a resource the company must create or supply. A Pub/Sub topic is the correct choice when building a custom publisher-to-subscriber pipeline manually.
- ✗
Cloud Scheduler job
Why it's wrong here
Cloud Scheduler creates cron-style triggers; it neither receives Cloud Storage object-creation events nor routes them to Cloud Run. It is tempting for time-based invocation of services, and would be correct if the requirement were a recurring schedule rather than reacting to new bucket objects.
- ✓
Eventarc trigger
Why this is correct
The Eventarc trigger binds the Cloud Storage event source to the Cloud Run destination and carries the bucket and object-prefix filter conditions. It satisfies the filtering requirement, since only the trigger itself can express which events reach the service.
- ✓
Cloud Run service
Why this is correct
The Cloud Run service is the event destination that Eventarc invokes on matching object creation. It must exist and be deployed before the trigger can reference it, satisfying the requirement to run processing logic when filtered events arrive.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Google Cloud exam blueprint
This PDE 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 PDE exam.