Google PCA Manage implementation of cloud architecture Practice Question
This PCA practice question tests your understanding of manage implementation of cloud architecture. 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.
Exhibit
{
"textPayload": "Error 403: The caller does not have permission to access the resource. Request prohibited by organization's policy. [ORGANIZATION_POLICY: constraints/iam.allowedPolicyMemberDomains]"
}
Refer to the exhibit. A cloud administrator is attempting to grant the BigQuery Data Viewer role to an external user (user@example.com) but receives the error shown. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Exhibit
{
"textPayload": "Error 403: The caller does not have permission to access the resource. Request prohibited by organization's policy. [ORGANIZATION_POLICY: constraints/iam.allowedPolicyMemberDomains]"
}
A
The organization policy constraints/iam.allowedPolicyMemberDomains blocks external domains.
The error includes '[ORGANIZATION_POLICY: constraints/iam.allowedPolicyMemberDomains]', indicating this policy is blocking the external user.
B
The BigQuery dataset requires domain-wide delegation.
Why wrong: Domain-wide delegation is for service accounts, not for granting roles to users.
C
The user does not have the resourcemanager.projects.setIamPolicy permission.
Why wrong: This would cause a different error (e.g., permission denied on the resource). The error specifically mentions organization policy.
D
The external user must first be added to a Google Group.
Why wrong: While adding to a group could bypass domain restrictions if the group's domain is allowed, the error directly points to the organization policy.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The organization policy constraints/iam.allowedPolicyMemberDomains blocks external domains.
The error indicates that the organization's policy constraints/iam.allowedPolicyMemberDomains is blocking the addition of an external user. This constraint restricts IAM policy bindings to only allow members from specified domains, and since user@example.com is from an external domain, the binding is denied. The error message directly references this constraint, making it the most likely cause.
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.
✓
The organization policy constraints/iam.allowedPolicyMemberDomains blocks external domains.
Why this is correct
The error includes '[ORGANIZATION_POLICY: constraints/iam.allowedPolicyMemberDomains]', indicating this policy is blocking the external user.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The BigQuery dataset requires domain-wide delegation.
Why it's wrong here
Domain-wide delegation is for service accounts, not for granting roles to users.
✗
The user does not have the resourcemanager.projects.setIamPolicy permission.
Why it's wrong here
This would cause a different error (e.g., permission denied on the resource). The error specifically mentions organization policy.
✗
The external user must first be added to a Google Group.
Why it's wrong here
While adding to a group could bypass domain restrictions if the group's domain is allowed, the error directly points to the organization policy.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google often tests the distinction between IAM permission errors and organization policy constraints, where candidates mistakenly focus on the administrator's permissions (Option C) rather than the broader policy that blocks external members.
Detailed technical explanation
How to think about this question
The iam.allowedPolicyMemberDomains constraint is defined at the organization level and can be set to allow only specific domains (e.g., only @yourcompany.com). When an external user is added, the IAM system checks this constraint and rejects the binding if the user's domain is not in the allowed list. This is enforced by the Resource Manager service, which evaluates organization policies before applying IAM changes.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Manage implementation of cloud architecture — This question tests Manage implementation of cloud architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The organization policy constraints/iam.allowedPolicyMemberDomains blocks external domains. — The error indicates that the organization's policy constraints/iam.allowedPolicyMemberDomains is blocking the addition of an external user. This constraint restricts IAM policy bindings to only allow members from specified domains, and since user@example.com is from an external domain, the binding is denied. The error message directly references this constraint, making it the most likely cause.
What should I do if I get this PCA 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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