Google ACE Configuring access and security Practice Question
This ACE practice question tests your understanding of configuring access and security. 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.
Refer to the exhibit. An application running on this instance is unable to write to a Cloud Storage bucket. What is the most likely cause?
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 access scopes only allow read access to Cloud Storage
When an instance is created with access scopes, these scopes restrict the API methods that the instance's credentials can use, regardless of the IAM permissions granted to the attached service account. The exhibit shows that the access scopes are set to 'Read Only' for Cloud Storage, which means the application can only call read methods (e.g., storage.objects.get) and cannot perform write operations (e.g., storage.objects.insert). This overrides any IAM role that would otherwise allow write access.
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 application is using the wrong authentication method
Why it's wrong here
The instance uses its service account; scope is the issue.
✓
The access scopes only allow read access to Cloud Storage
Why this is correct
The scope is read_only, so write operations are denied regardless of IAM role.
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 Cloud Storage bucket is in a different project
Why it's wrong here
Cross-project access is possible with proper permissions; not indicated.
✗
The service account does not have the storage.objectAdmin IAM role
Why it's wrong here
The scope issue is more restrictive; even with IAM role, scope blocks write.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between IAM permissions and access scopes, trapping candidates who assume that a service account with the correct IAM role can always perform the action, ignoring that access scopes can override those permissions at the instance level.
Detailed technical explanation
How to think about this question
Access scopes are legacy OAuth 2.0 scopes that define the API surface a service account can call when authenticating via the instance metadata server. For example, the scope 'https://www.googleapis.com/auth/devstorage.read_only' maps to read-only Cloud Storage methods, while 'https://www.googleapis.com/auth/cloud-platform' grants full access. In modern GCP, IAM roles are the primary authorization mechanism, but scopes act as a secondary gate; if scopes deny a method, the call fails with a 403 error even if IAM allows it. This is a common pitfall when migrating from legacy scopes to IAM-only access.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this ACE question in full detail.
Configuring access and security — This question tests Configuring access and security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The access scopes only allow read access to Cloud Storage — When an instance is created with access scopes, these scopes restrict the API methods that the instance's credentials can use, regardless of the IAM permissions granted to the attached service account. The exhibit shows that the access scopes are set to 'Read Only' for Cloud Storage, which means the application can only call read methods (e.g., storage.objects.get) and cannot perform write operations (e.g., storage.objects.insert). This overrides any IAM role that would otherwise allow write access.
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: "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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