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Question 457 of 500

Configuring access within a cloud solution environment →mediumMultiple ChoiceObjective-mapped

PCSE Practice Question: Configuring access within a cloud solution environment

This PCSE practice question tests your understanding of configuring access within a cloud solution environment. 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.

Exhibit

Refer to the exhibit.
```
Audit Log Entry:
{
  "serviceName": "dataflow.googleapis.com",
  "methodName": "google.cloud.dataflow.v1beta3.Jobs.Create",
  "authenticationInfo": {
    "principalEmail": "my-sa@my-project.iam.gserviceaccount.com"
  },
  "authorizationInfo": [
    {
      "resource": "projects/my-project/serviceAccounts/my-project-compute@developer.gserviceaccount.com",
      "permission": "iam.serviceAccounts.actAs",
      "granted": false
    }
  ]
}
```

A Dataflow job launched by service account 'my-sa@...' fails with permission denied. The audit log shows the above entry. What missing role is causing the failure?

Question 1mediummultiple choice

Full question →

Exhibit

Refer to the exhibit.
```
Audit Log Entry:
{
  "serviceName": "dataflow.googleapis.com",
  "methodName": "google.cloud.dataflow.v1beta3.Jobs.Create",
  "authenticationInfo": {
    "principalEmail": "my-sa@my-project.iam.gserviceaccount.com"
  },
  "authorizationInfo": [
    {
      "resource": "projects/my-project/serviceAccounts/my-project-compute@developer.gserviceaccount.com",
      "permission": "iam.serviceAccounts.actAs",
      "granted": false
    }
  ]
}
```

A
roles/iam.workloadIdentityUser on the worker service account
Why wrong: This role is for workload identity federation.
B
roles/iam.serviceAccountUser on the worker service account
This role grants the actAs permission.
C
roles/iam.serviceAccountAdmin on the worker service account
Why wrong: This role grants admin permissions, not actAs.
D
roles/iam.serviceAccountTokenCreator on the worker service account
Why wrong: This role grants token creation, not actAs.

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

✓

roles/iam.serviceAccountUser on the worker service account

When a Dataflow job fails with permission denied and the audit log shows the entry, the missing role is typically roles/iam.serviceAccountUser on the worker service account. This role is required because the Dataflow service (or the service account launching the job) must be able to impersonate the worker service account to execute the pipeline's tasks. Without this role, the job cannot assume the identity of the worker service account, leading to the permission denied error.

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.

✗
roles/iam.workloadIdentityUser on the worker service account
Why it's wrong here
This role is for workload identity federation.
✓
roles/iam.serviceAccountUser on the worker service account
Why this is correct
This role grants the actAs permission.
Related concept
Read the scenario before looking for a memorised answer.
✗
roles/iam.serviceAccountAdmin on the worker service account
Why it's wrong here
This role grants admin permissions, not actAs.
✗
roles/iam.serviceAccountTokenCreator on the worker service account
Why it's wrong here
This role grants token creation, not actAs.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Google Cloud often tests the distinction between roles that grant administrative control (serviceAccountAdmin) versus roles that grant impersonation (serviceAccountUser), and candidates mistakenly choose serviceAccountAdmin thinking it includes all permissions, but impersonation requires the specific actAs permission.

Detailed technical explanation

How to think about this question

Under the hood, Dataflow uses the worker service account to access resources like Cloud Storage and BigQuery. The launching service account must have the iam.serviceAccounts.actAs permission (granted by roles/iam.serviceAccountUser) to impersonate the worker service account via the IAM API's generateAccessToken or signBlob methods. Without this, the job fails at initialization because the worker nodes cannot assume the required identity. In real-world scenarios, this often occurs when a custom service account is specified for workers but the job launcher lacks the impersonation privilege.

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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

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 PCSE question test?

Configuring access within a cloud solution environment — This question tests Configuring access within 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: roles/iam.serviceAccountUser on the worker service account — When a Dataflow job fails with permission denied and the audit log shows the entry, the missing role is typically roles/iam.serviceAccountUser on the worker service account. This role is required because the Dataflow service (or the service account launching the job) must be able to impersonate the worker service account to execute the pipeline's tasks. Without this role, the job cannot assume the identity of the worker service account, leading to the permission denied error.

What should I do if I get this PCSE 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

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