- A
IAM deny policies restricting cross-project BigQuery operations
Why wrong: IAM deny policies block specific IAM actions — they don't prevent an authorized user from copying data to an external project if they have the necessary permissions there.
- B
VPC Service Controls with a perimeter enclosing BigQuery
VPC Service Controls enforce context-aware access at the API level — data can't leave the perimeter to external projects regardless of IAM permissions, preventing exfiltration.
- C
An organization policy preventing resource creation outside specific projects
Why wrong: Organization policies restrict what types of resources can be created — they don't prevent copying data between existing projects.
- D
Cloud Armor rules blocking outbound API requests to BigQuery in other projects
Why wrong: Cloud Armor is a WAF for incoming HTTP traffic to load balancers — it doesn't control GCP API calls between projects.
Quick Answer
The answer is VPC Service Controls, which block BigQuery data exfiltration across projects by creating a security perimeter around the service. Unlike IAM, which grants or denies access to resources, VPC Service Controls enforce a data boundary that prevents data from being moved to projects outside the perimeter, even if the user has valid IAM permissions. On the Google Associate Cloud Engineer exam, this concept tests your understanding of defense-in-depth: IAM controls who can access data, but VPC Service Controls control where that data can go. A common trap is assuming IAM alone is sufficient for data exfiltration prevention, but the exam emphasizes that VPC-SC overrides IAM for data movement. Remember the mnemonic “IAM for who, VPC-SC for where” to distinguish these layers.
Google ACE Configuring access and security Practice Question
This ACE practice question tests your understanding of configuring access and security. 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 security team wants to prevent authorized users from copying BigQuery query results to a dataset in a different GCP project that is outside the team's security boundary — even if the user has valid IAM permissions. Which control enforces this?
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
VPC Service Controls with a perimeter enclosing BigQuery
VPC Service Controls (VPC-SC) create a security perimeter around Google Cloud services, including BigQuery, that prevents data exfiltration to projects outside the perimeter regardless of IAM permissions. By configuring a service perimeter that includes BigQuery and the authorized project, any attempt to copy query results to a dataset in a project outside the perimeter is blocked, even if the user has valid IAM roles. This enforces a data boundary that overrides IAM-based 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.
- ✗
IAM deny policies restricting cross-project BigQuery operations
Why it's wrong here
IAM deny policies block specific IAM actions — they don't prevent an authorized user from copying data to an external project if they have the necessary permissions there.
- ✓
VPC Service Controls with a perimeter enclosing BigQuery
Why this is correct
VPC Service Controls enforce context-aware access at the API level — data can't leave the perimeter to external projects regardless of IAM permissions, preventing exfiltration.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
An organization policy preventing resource creation outside specific projects
Why it's wrong here
Organization policies restrict what types of resources can be created — they don't prevent copying data between existing projects.
- ✗
Cloud Armor rules blocking outbound API requests to BigQuery in other projects
Why it's wrong here
Cloud Armor is a WAF for incoming HTTP traffic to load balancers — it doesn't control GCP API calls between projects.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume IAM deny policies can block data movement across projects, but VPC Service Controls are the only mechanism that enforces data exfiltration boundaries at the network layer, overriding IAM permissions.
Detailed technical explanation
How to think about this question
VPC Service Controls use a service perimeter defined by a set of projects and services, and enforce data exfiltration rules by inspecting the destination of API calls at the Google Cloud infrastructure level. When a user tries to export BigQuery query results to a dataset in a project outside the perimeter, the API call is intercepted and denied with an error like 'Access Denied: VPC Service Controls' even if the user has BigQuery Data Editor or Owner roles. This is implemented via the Access Context Manager, which evaluates the request against the perimeter's ingress and egress rules before the IAM check completes.
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 ACE question test?
Configuring access and security — This question tests Configuring access and security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: VPC Service Controls with a perimeter enclosing BigQuery — VPC Service Controls (VPC-SC) create a security perimeter around Google Cloud services, including BigQuery, that prevents data exfiltration to projects outside the perimeter regardless of IAM permissions. By configuring a service perimeter that includes BigQuery and the authorized project, any attempt to copy query results to a dataset in a project outside the perimeter is blocked, even if the user has valid IAM roles. This enforces a data boundary that overrides IAM-based access.
What should I do if I get this ACE 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 11, 2026
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