- A
Embed a developer's user account credentials in the application configuration file
Why wrong: Embedding user credentials is a serious security risk — credentials can leak and are tied to a human account rather than the application.
- B
Attach a service account with the Storage Object Viewer role to the VM
Service accounts attached to VMs allow applications to authenticate automatically via the metadata server. This eliminates the need to manage credentials directly.
- C
Create an API key and store it as an environment variable on the VM
Why wrong: API keys are not recommended for server-to-server authentication and do not support fine-grained IAM access control for Cloud Storage.
- D
Grant the VM's IP address access to the bucket using a VPC firewall rule
Why wrong: Firewall rules control network traffic — they do not grant IAM permissions to access Cloud Storage resources.
Quick Answer
The answer is to attach a service account with the Storage Object Viewer role to the GCE VM. This is the recommended authentication approach because the VM’s metadata server automatically provides OAuth 2.0 access tokens for the attached service account, allowing the application to authenticate to Cloud Storage without embedding or managing any credentials in the code. On the Google Associate Cloud Engineer exam, this scenario tests your understanding of identity-based access over key-based access; a common trap is choosing to generate and store a JSON key file on the VM, which is less secure and not recommended. Remember that the metadata server handles token refresh automatically, so your application code only needs to call the default credentials. Memory tip: “Attach, don’t stash” — attach the role to the VM, never stash a key file on the instance.
Google ACE Setting up a cloud solution environment Practice Question
This ACE practice question tests your understanding of setting up a cloud solution environment. 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.
An application running on a Compute Engine VM needs to read objects from a Cloud Storage bucket in the same project. What is the recommended authentication approach?
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
Attach a service account with the Storage Object Viewer role to the VM
Option B is correct because attaching a service account with the Storage Object Viewer role to the Compute Engine VM is the recommended and secure method for authenticating to Cloud Storage. The VM automatically obtains OAuth 2.0 access tokens for the service account via the metadata server, eliminating the need to manage or embed credentials in the application code.
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.
- ✗
Embed a developer's user account credentials in the application configuration file
Why it's wrong here
Embedding user credentials is a serious security risk — credentials can leak and are tied to a human account rather than the application.
- ✓
Attach a service account with the Storage Object Viewer role to the VM
Why this is correct
Service accounts attached to VMs allow applications to authenticate automatically via the metadata server. This eliminates the need to manage credentials directly.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create an API key and store it as an environment variable on the VM
Why it's wrong here
API keys are not recommended for server-to-server authentication and do not support fine-grained IAM access control for Cloud Storage.
- ✗
Grant the VM's IP address access to the bucket using a VPC firewall rule
Why it's wrong here
Firewall rules control network traffic — they do not grant IAM permissions to access Cloud Storage resources.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that API keys or IP-based firewall rules can control access to Cloud Storage, when in fact Cloud Storage relies solely on IAM roles and OAuth 2.0 tokens for authentication and authorization.
Detailed technical explanation
How to think about this question
Under the hood, the Compute Engine metadata server exposes a service account token endpoint at `http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token`. The Google Cloud Storage client libraries automatically fetch and refresh OAuth 2.0 tokens from this endpoint, using the default service account or a custom one attached to the VM. This approach avoids hardcoding secrets and supports automatic token rotation, which is critical for long-running applications or those that scale across many 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.
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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FAQ
Questions learners often ask
What does this ACE question test?
Setting up a cloud solution environment — This question tests Setting up 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: Attach a service account with the Storage Object Viewer role to the VM — Option B is correct because attaching a service account with the Storage Object Viewer role to the Compute Engine VM is the recommended and secure method for authenticating to Cloud Storage. The VM automatically obtains OAuth 2.0 access tokens for the service account via the metadata server, eliminating the need to manage or embed credentials in the application code.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This ACE 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 ACE exam.
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