PCSE Practice Question: Configuring access within a cloud solution environment
This PCSE practice question tests your understanding of configuring access within a cloud solution environment. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 startup is using Cloud Functions to process files uploaded to a Cloud Storage bucket. The Cloud Function is triggered by finalize events on the bucket. The developers created a service account for the Cloud Function and granted it the roles/storage.objectViewer role on the bucket. However, the function fails with a permission denied when trying to read the file. The function has the following XML in the event context: 'event_id'. What is the most likely issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Cloud Function is using the default App Engine service account instead of the custom service account.
The most likely issue is that the Cloud Function is using the default App Engine service account instead of the custom service account that was granted the roles/storage.objectViewer role. When a Cloud Function is deployed without explicitly specifying a service account, it defaults to the App Engine default service account (project-id@appspot.gserviceaccount.com), which does not have the necessary permissions to read the file. The custom service account with the objectViewer role exists but is not assigned to the function, causing the permission denied error.
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.
✓
The Cloud Function is using the default App Engine service account instead of the custom service account.
Why this is correct
The default service account may not have the required permissions, leading to the error.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The service account does not exist.
Why it's wrong here
The service account was created.
✗
The bucket is in a different project, and cross-project access is not configured.
Why it's wrong here
The scenario implies same project.
✗
The Cloud Function is not configured to be triggered by the correct event type.
Why it's wrong here
The trigger is set to finalize events.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the default service account behavior in serverless services, where candidates assume that granting permissions to a custom service account automatically applies to the function, but the function must be explicitly configured to use that account.
Trap categories for this question
Scenario analysis trap
The scenario implies same project.
Detailed technical explanation
How to think about this question
Cloud Functions use the identity of the service account specified in the --service-account flag during deployment; if omitted, it defaults to the App Engine default service account. The roles/storage.objectViewer role grants read access to objects, but the function must be running under that identity. In real-world scenarios, this misconfiguration is common when developers create a custom service account but forget to attach it to the function, leading to silent failures that are hard to debug without checking the function's runtime identity.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
Configuring access within a cloud solution environment — This question tests Configuring access within a cloud solution environment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Cloud Function is using the default App Engine service account instead of the custom service account. — The most likely issue is that the Cloud Function is using the default App Engine service account instead of the custom service account that was granted the roles/storage.objectViewer role. When a Cloud Function is deployed without explicitly specifying a service account, it defaults to the App Engine default service account (project-id@appspot.gserviceaccount.com), which does not have the necessary permissions to read the file. The custom service account with the objectViewer role exists but is not assigned to the function, causing the permission denied error.
What should I do if I get this PCSE 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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