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Design for security and compliance →hardMultiple ChoiceObjective-mapped

Google PCA Design for security and compliance Practice Question

This PCA practice question tests your understanding of design for security and compliance. 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.

Exhibit

Refer to the exhibit.

{
  "bindings": [
    {
      "role": "roles/storage.objectViewer",
      "members": [
        "user:alice@example.com",
        "serviceAccount:my-sa@project.iam.gserviceaccount.com"
      ]
    },
    {
      "role": "roles/storage.objectCreator",
      "members": [
        "user:bob@example.com"
      ]
    }
  ],
  "etag": "BwWw=="
}

A security administrator wants to ensure that a Cloud Storage bucket named `gs://my-bucket` is only accessible by service accounts, not user accounts. Which action should they take?

Question 1hardmultiple choice
Full question →

Exhibit

Refer to the exhibit.

{
  "bindings": [
    {
      "role": "roles/storage.objectViewer",
      "members": [
        "user:alice@example.com",
        "serviceAccount:my-sa@project.iam.gserviceaccount.com"
      ]
    },
    {
      "role": "roles/storage.objectCreator",
      "members": [
        "user:bob@example.com"
      ]
    }
  ],
  "etag": "BwWw=="
}

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

✓

Create a new IAM policy that removes all user members and adds a service account member with `roles/storage.objectAdmin`.

Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    Remove the user from the `roles/storage.objectViewer` binding and add a condition to deny user access.

    Why it's wrong here

    IAM does not support deny conditions; only allow conditions are supported.

  • ✗

    Add a bucket IAM condition that requires `resource.name.startsWith("projects/_/buckets/my-bucket/objects/")`

    Why it's wrong here

    This condition restricts access to the bucket but does not remove user access.

  • ✗

    Use a VPC Service Controls perimeter to block user access.

    Why it's wrong here

    VPC Service Controls restrict access from outside the perimeter but do not differentiate between user and service accounts.

  • ✓

    Create a new IAM policy that removes all user members and adds a service account member with `roles/storage.objectAdmin`.

    Why this is correct

    Removing user members ensures only service accounts have access, and granting objectAdmin to a service account meets the requirement.

    Related concept

    Standard ACLs match source addresses.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

  • Standard ACLs match source addresses.
  • Extended ACLs can match source, destination, protocol and ports.
  • The first matching ACL entry is used.
  • There is usually an implicit deny at the end.

TExam Day Tips

  • Check inbound versus outbound direction.
  • Read the ACL from top to bottom.
  • Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

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.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PCA ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this PCA question test?

Design for security and compliance — This question tests Design for security and compliance — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Create a new IAM policy that removes all user members and adds a service account member with `roles/storage.objectAdmin`.

What should I do if I get this PCA question wrong?

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PCA ACL questions on filtering logic and placement.

What is the key concept behind this question?

Standard ACLs match source addresses.

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Last reviewed: Jun 24, 2026

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This PCA 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 PCA exam.