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Question 365 of 507

Trust and security with Google Cloud →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is to grant Storage Object Viewer (roles/storage.objectViewer) at the specific bucket level for each service account. This is correct because it applies the principle of least privilege by restricting permissions to exactly what is needed—read-only access to objects in a single bucket—rather than assigning broad roles like Storage Admin at the project level, which would allow unintended modifications or deletions across all storage resources. On the Google Cloud Digital Leader exam, this scenario tests your understanding of resource-level IAM versus project-level IAM, a common trap where candidates mistakenly choose a project-wide role for simplicity. The key distinction is that IAM roles can be inherited from the project, but to enforce least privilege, you must attach them directly to the bucket resource. A useful memory tip: think “bucket-level bindings, not project-wide bloat”—if a service account only needs to read objects, lock it to the bucket with Object Viewer, not the entire project.

Cloud Digital Leader Trust and security with Google Cloud Practice Question

This GCDL practice question tests your understanding of trust and security with google cloud. 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 security audit finds that a company's application service accounts have been granted broad IAM roles (e.g., Storage Admin on the entire project) when they only need to read specific Cloud Storage buckets. The auditor recommends following the principle of least privilege. What is the most precise way to implement this for the Cloud Storage use case?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.

Question 1hardmultiple choice

Full question →

A
Grant the Storage Admin role at the project level but add a condition that limits it to specific operations
Why wrong: IAM conditions can restrict by resource name or time, but starting with Storage Admin (which includes delete and create bucket permissions) and trying to narrow it is harder and more error-prone than starting with a minimal role at the resource level.
B
Grant Storage Object Viewer (read-only) at the specific bucket level for each service account that needs read access — not at the project level
This is the most precise least-privilege implementation. Storage Object Viewer grants read access to objects within a bucket. Binding it at the bucket level (not project) means the service account can only read from that specific bucket — not create buckets, not access other buckets, not delete objects. This minimizes blast radius if the service account is compromised.
C
Create a custom IAM role that combines all permissions from all predefined roles but removes the most dangerous ones
Why wrong: Starting from all permissions and removing dangerous ones is the opposite of least privilege — it's more likely to leave excessive permissions than starting from a minimal set and adding only what's needed.
D
Use the same broad Storage Admin role but rotate the service account key every 90 days to reduce the window of exposure
Why wrong: Key rotation reduces credential exposure time but doesn't address the core problem: the service account has far more permissions than it needs. A compromised credential within the 90-day window still has full Storage Admin access. Least privilege reduces blast radius; rotation reduces exposure duration — both are needed, but least privilege must be addressed first.

Full breakdown with real-world context →

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

✓

Grant Storage Object Viewer (read-only) at the specific bucket level for each service account that needs read access — not at the project level

Option B is correct because it grants the minimal required permission (Storage Object Viewer) at the specific bucket level, adhering to the principle of least privilege. This ensures the service account can only read objects in that bucket and cannot perform any other storage operations, even accidentally. Granting roles at the resource level (bucket) rather than the project level eliminates unnecessary broad 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.

✗
Grant the Storage Admin role at the project level but add a condition that limits it to specific operations
Why it's wrong here
IAM conditions can restrict by resource name or time, but starting with Storage Admin (which includes delete and create bucket permissions) and trying to narrow it is harder and more error-prone than starting with a minimal role at the resource level.
✓
Grant Storage Object Viewer (read-only) at the specific bucket level for each service account that needs read access — not at the project level
Why this is correct
This is the most precise least-privilege implementation. Storage Object Viewer grants read access to objects within a bucket. Binding it at the bucket level (not project) means the service account can only read from that specific bucket — not create buckets, not access other buckets, not delete objects. This minimizes blast radius if the service account is compromised.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a custom IAM role that combines all permissions from all predefined roles but removes the most dangerous ones
Why it's wrong here
Starting from all permissions and removing dangerous ones is the opposite of least privilege — it's more likely to leave excessive permissions than starting from a minimal set and adding only what's needed.
✗
Use the same broad Storage Admin role but rotate the service account key every 90 days to reduce the window of exposure
Why it's wrong here
Key rotation reduces credential exposure time but doesn't address the core problem: the service account has far more permissions than it needs. A compromised credential within the 90-day window still has full Storage Admin access. Least privilege reduces blast radius; rotation reduces exposure duration — both are needed, but least privilege must be addressed first.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often think project-level roles with conditions are sufficient, but conditions do not restrict the scope of resources the role applies to—only the actions or attributes—so the role still applies to all resources in the project.

Detailed technical explanation

How to think about this question

IAM roles in Google Cloud are collections of permissions; granting Storage Object Viewer (roles/storage.objectViewer) at the bucket level uses the resource hierarchy to scope access. Under the hood, IAM policy evaluation checks the resource hierarchy from the resource up to the organization level, and a deny at a higher level cannot be overridden by a grant at a lower level. In a real-world scenario, if a service account only needs to read logs from a specific bucket, granting Storage Object Viewer at that bucket prevents it from accidentally deleting objects in other buckets or listing all buckets in the project.

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 GCDL question test?

Trust and security with Google Cloud — This question tests Trust and security with Google Cloud — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Grant Storage Object Viewer (read-only) at the specific bucket level for each service account that needs read access — not at the project level — Option B is correct because it grants the minimal required permission (Storage Object Viewer) at the specific bucket level, adhering to the principle of least privilege. This ensures the service account can only read objects in that bucket and cannot perform any other storage operations, even accidentally. Granting roles at the resource level (bucket) rather than the project level eliminates unnecessary broad access.

What should I do if I get this GCDL 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: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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