- A
IAM permissions that restrict users from accessing competitor projects
Why wrong: IAM controls access within your own organization's projects. You have no ability to grant or deny IAM permissions in a competitor's Google Cloud project. IAM cannot prevent copying data to external projects.
- B
Cloud DLP, by scanning and redacting sensitive data before it can be stored
Why wrong: Cloud DLP identifies and redacts sensitive data but doesn't prevent authorized users from copying data to external destinations. It addresses data content, not data movement paths.
- C
VPC Service Controls, which create a security perimeter around Google Cloud APIs so data cannot be moved to projects outside the defined perimeter
VPC Service Controls are precisely designed for this. A service perimeter defines which projects can exchange data with each other. Even if a user has valid credentials, the API enforces that data cannot be read from inside the perimeter and written outside it — blocking the insider exfiltration pattern described.
- D
Organization Policy constraints that prevent resource creation in competitor accounts
Why wrong: Organization policies apply within your own Google Cloud organization. You have no ability to define policies for competitor organizations. Organization Policy cannot control what happens in accounts you don't own.
Quick Answer
The answer is VPC Service Controls, which most directly prevent data exfiltration to a competitor’s Google Cloud project. This security control creates a security perimeter around Google Cloud APIs, blocking any data movement—such as copying files from your Cloud Storage bucket to a bucket owned by a competitor—regardless of the user’s IAM permissions. On the Google Cloud Digital Leader exam, this concept tests your understanding of perimeter-based security versus identity-based controls; a common trap is confusing VPC Service Controls with IAM or firewall rules, which do not prevent API-level exfiltration. Remember that VPC Service Controls work at the API layer, intercepting requests that try to move data outside your defined perimeter, making them the direct solution for insider data exfiltration scenarios. Memory tip: think of it as a “no-export zone” for your APIs—if the data tries to leave the perimeter, it gets blocked before it can even start.
Cloud Digital Leader Trust and security with Google Cloud Practice Question
This GCDL practice question tests your understanding of trust and security with google cloud. 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.
An organization wants to ensure that Google Cloud services used by its employees cannot be used to exfiltrate data to a competitor's Google Cloud project. For example, they want to prevent copying data from their Cloud Storage bucket to a Storage bucket owned by a competitor. Which Google Cloud security control most directly prevents this type of insider data exfiltration?
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, which create a security perimeter around Google Cloud APIs so data cannot be moved to projects outside the defined perimeter
VPC Service Controls (C) directly prevent data exfiltration by creating a security perimeter around Google Cloud APIs. This perimeter blocks any data movement to resources outside the defined perimeter, such as a competitor's Cloud Storage bucket, regardless of the user's IAM permissions. It works at the API layer, intercepting requests that attempt to copy data to an unauthorized project.
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 permissions that restrict users from accessing competitor projects
Why it's wrong here
IAM controls access within your own organization's projects. You have no ability to grant or deny IAM permissions in a competitor's Google Cloud project. IAM cannot prevent copying data to external projects.
- ✗
Cloud DLP, by scanning and redacting sensitive data before it can be stored
Why it's wrong here
Cloud DLP identifies and redacts sensitive data but doesn't prevent authorized users from copying data to external destinations. It addresses data content, not data movement paths.
- ✓
VPC Service Controls, which create a security perimeter around Google Cloud APIs so data cannot be moved to projects outside the defined perimeter
Why this is correct
VPC Service Controls are precisely designed for this. A service perimeter defines which projects can exchange data with each other. Even if a user has valid credentials, the API enforces that data cannot be read from inside the perimeter and written outside it — blocking the insider exfiltration pattern described.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Organization Policy constraints that prevent resource creation in competitor accounts
Why it's wrong here
Organization policies apply within your own Google Cloud organization. You have no ability to define policies for competitor organizations. Organization Policy cannot control what happens in accounts you don't own.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse IAM permissions with network-level controls, assuming that restricting IAM access to competitor projects is sufficient, but VPC Service Controls are the only mechanism that enforces a boundary at the API layer regardless of user identity.
Detailed technical explanation
How to think about this question
VPC Service Controls enforce a security perimeter by intercepting API calls at the Google Front End (GFE) and checking the request against the perimeter's policy. If the destination project is outside the perimeter, the API call is denied with an HTTP 403 error, even if the user has valid IAM credentials. This mechanism is independent of IAM and works at the network edge, making it effective against both accidental and malicious data transfers.
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 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.
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FAQ
Questions learners often ask
What does this GCDL question test?
Trust and security with Google Cloud — This question tests Trust and security with Google Cloud — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: VPC Service Controls, which create a security perimeter around Google Cloud APIs so data cannot be moved to projects outside the defined perimeter — VPC Service Controls (C) directly prevent data exfiltration by creating a security perimeter around Google Cloud APIs. This perimeter blocks any data movement to resources outside the defined perimeter, such as a competitor's Cloud Storage bucket, regardless of the user's IAM permissions. It works at the API layer, intercepting requests that attempt to copy data to an unauthorized project.
What should I do if I get this GCDL 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.
About these practice questions
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Last reviewed: Jun 11, 2026
This GCDL 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 GCDL exam.
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