The answer is to use IAM conditions to restrict access to the bucket only when the requester is the CI/CD service account. This is correct because IAM conditions allow you to bind a role to a principal and then enforce access based on request attributes, such as the `iam.googleapis.com/principal` attribute, ensuring that only the CI/CD pipeline’s identity can write to the central Cloud Storage bucket, even if other principals hold the same role. On the Google Professional Cloud DevOps Engineer exam, this tests your ability to enforce centralized Terraform state storage without relying on network-based controls or overly broad roles—a common trap is choosing a VPC Service Controls or bucket policy that doesn’t tie access to a specific service account identity. Remember the key: IAM conditions are identity-aware, not network-aware, so they directly enforce “who” can write, not “where” they write from. Memory tip: think “condition equals principal” to lock state writes to your pipeline.
PCDOE Practice Question: Bootstrapping a Google Cloud organization for DevOps
This PCDOE practice question tests your understanding of bootstrapping a google cloud organization for devops. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Your organization has multiple teams that need to deploy infrastructure using Terraform. You want to enforce that all Terraform state files are stored in a central Cloud Storage bucket with versioning enabled. You also need to ensure that only the CI/CD pipeline can write to the bucket. What is the best way to enforce this?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use IAM conditions to restrict access to the bucket only when the requester is the CI/CD service account.
Option D is correct because IAM conditions allow you to bind a role to a principal (the CI/CD service account) and then restrict access based on attributes of the request, such as the requester's identity. By using a condition that checks `iam.googleapis.com/principal` equals the CI/CD service account email, you ensure that only that specific service account can write to the bucket, even if other principals have the role. This enforces the policy without relying on network constructs or overly broad role assignments.
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.
✗
Use VPC Service Controls to restrict access to the bucket from only the CI/CD pipeline's VPC.
Why it's wrong here
VPC-SC controls network access, not IAM; it does not enforce identity-based restrictions.
✗
Create a custom IAM role with permissions to write to the bucket and assign it to the CI/CD service account.
Why it's wrong here
This still allows other identities with the same role or higher to write.
✗
Grant the Storage Object Admin role to the CI/CD service account at the bucket level.
Why it's wrong here
This does not prevent other identities from writing if they have project-level access.
✓
Use IAM conditions to restrict access to the bucket only when the requester is the CI/CD service account.
Why this is correct
IAM conditions can enforce that only the specific service account can write.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between identity-based access control (IAM conditions) and network-based controls (VPC Service Controls), leading candidates to choose VPC SC when the requirement is to restrict by identity, not network.
Detailed technical explanation
How to think about this question
IAM conditions use Common Expression Language (CEL) to evaluate request attributes at runtime. The condition `iam.googleapis.com/principal == 'serviceAccount:ci-cd-sa@project.iam.gserviceaccount.com'` is evaluated before the request is authorized, ensuring that even if the role is granted to multiple principals, only the specified service account can perform the action. This is more granular than bucket-level IAM policies because it can be applied to a specific principal without creating separate roles or relying on network boundaries.
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.
Bootstrapping a Google Cloud organization for DevOps — This question tests Bootstrapping a Google Cloud organization for DevOps — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use IAM conditions to restrict access to the bucket only when the requester is the CI/CD service account. — Option D is correct because IAM conditions allow you to bind a role to a principal (the CI/CD service account) and then restrict access based on attributes of the request, such as the requester's identity. By using a condition that checks `iam.googleapis.com/principal` equals the CI/CD service account email, you ensure that only that specific service account can write to the bucket, even if other principals have the role. This enforces the policy without relying on network constructs or overly broad role assignments.
What should I do if I get this PCDOE 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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