Google PCA Design for security and compliance Practice Question
This PCA practice question tests your understanding of design for security and compliance. 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.
A company wants to allow developers to create service accounts in a project but prevent them from granting the 'roles/iam.serviceAccountUser' role to any user. Which organization policy constraint should they set?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the constraint 'iam.restrictGrantableRoles' to ['roles/iam.serviceAccountUser'].
Option A is correct because 'iam.disableServiceAccountKeyCreation' disables service account key creation, not role granting. Option B is correct because 'iam.allowedPolicyMemberDomains' restricts which domains can be granted roles. Actually the correct constraint to prevent granting roles is 'iam.restrictGrantableRoles'. Wait, let's think: The question asks to prevent developers from granting a specific role. The correct constraint is 'iam.restrictGrantableRoles' which allows you to restrict the roles that can be granted. Option B is about domains. Option D is about denying usage of service account impersonation? Actually, the correct answer is 'Workload Identity pools' not a constraint. The correct constraint is 'iam.restrictGrantableRoles'. So I need to pick the right one. Let's correct: Option A: iam.disableServiceAccountKeyCreation - that prevents creating keys, not granting roles. Option B: iam.allowedPolicyMemberDomains - limits which domains can be members. Option C: iam.restrictGrantableRoles - limits which roles can be granted. Option D: iam.workloadIdentityPoolProviders - for workload identity. So the correct is Option C. I need to adjust the JSON accordingly. Actually in the JSON below I had a mistake. I'll correct now.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Set the constraint 'iam.restrictGrantableRoles' to ['roles/iam.serviceAccountUser'].
Why this is correct
This constraint prevents granting the specified role, even if the user has permission to grant roles.
Related concept
Static NAT maps one inside address to one outside address.
✗
Set the constraint 'iam.allowedPolicyMemberDomains' to include only the company's domain.
Why it's wrong here
This restricts which domains can be members, but does not prevent granting specific roles.
✗
Set the constraint 'iam.disableServiceAccountKeyCreation' to True.
Why it's wrong here
This constraint prevents creation of service account keys, not granting roles.
✗
Set the constraint 'iam.workloadIdentityPoolProviders' to deny all.
Why it's wrong here
This controls workload identity federation, not role granting.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCA NAT questions on configuration and troubleshooting.
Design for security and compliance — This question tests Design for security and compliance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Set the constraint 'iam.restrictGrantableRoles' to ['roles/iam.serviceAccountUser']. — Option A is correct because 'iam.disableServiceAccountKeyCreation' disables service account key creation, not role granting. Option B is correct because 'iam.allowedPolicyMemberDomains' restricts which domains can be granted roles. Actually the correct constraint to prevent granting roles is 'iam.restrictGrantableRoles'. Wait, let's think: The question asks to prevent developers from granting a specific role. The correct constraint is 'iam.restrictGrantableRoles' which allows you to restrict the roles that can be granted. Option B is about domains. Option D is about denying usage of service account impersonation? Actually, the correct answer is 'Workload Identity pools' not a constraint. The correct constraint is 'iam.restrictGrantableRoles'. So I need to pick the right one. Let's correct: Option A: iam.disableServiceAccountKeyCreation - that prevents creating keys, not granting roles. Option B: iam.allowedPolicyMemberDomains - limits which domains can be members. Option C: iam.restrictGrantableRoles - limits which roles can be granted. Option D: iam.workloadIdentityPoolProviders - for workload identity. So the correct is Option C. I need to adjust the JSON accordingly. Actually in the JSON below I had a mistake. I'll correct now.
What should I do if I get this PCA question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCA NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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