- A
The VPC Service Controls perimeter allows access from resources within the same project, even if they are outside the perimeter.
VPC Service Controls only block access from outside the perimeter; resources within the same project are considered inside and allowed by default.
- B
The Cloud KMS key used for encryption was not bound to the perimeter.
Why wrong: CMEK does not affect VPC Service Controls enforcement; it is about encryption, not access control.
- C
The Cloud Audit Logs were not enabled for the Cloud Storage bucket, so the access was not logged.
Why wrong: The auditor reviewed logs, so logging was enabled.
- D
The VPC Service Controls perimeter was not configured to include the Cloud Storage bucket.
Why wrong: If the bucket is within the perimeter, access from outside is blocked; however, the instance is inside the project, so it might still be allowed.
Quick Answer
The answer is that VPC Service Controls perimeters explicitly allow access from resources within the same project, even if those resources are outside the perimeter. This is by design: the perimeter blocks data exfiltration from external networks but does not restrict traffic between services sharing the same Google Cloud project, as the compromised Compute Engine instance demonstrated. On the Google Professional Cloud Security Engineer exam, this concept tests your understanding that VPC Service Controls are not a substitute for IAM or network-level firewalls within a project—a common trap is assuming the perimeter isolates all intra-project access. The key nuance is that the perimeter enforces boundaries across projects, not within them. For the exam, remember the mnemonic: "Same project, same trust; perimeter only guards the crust."
PCSE Ensuring data protection Practice Question
This PCSE practice question tests your understanding of ensuring data protection. 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.
Your company runs a data analytics platform on Google Cloud that processes sensitive financial data. Data is ingested from various sources into a Cloud Storage bucket, then processed by Dataflow jobs, and final results are stored in BigQuery. You have implemented the following security controls: - VPC Service Controls perimeter around the project - Cloud KMS CMEK for all storage services - IAM conditions restricting access based on tags - Cloud Audit Logs enabled for all services
Recently, an auditor discovered that a compromised service account was able to read data from the Cloud Storage bucket even though it was outside the VPC Service Controls perimeter. The auditor reviewed the logs and found that the access came from a Compute Engine instance that was running within the same project. What is the most likely reason the VPC Service Controls perimeter did not block this access?
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.
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
The VPC Service Controls perimeter allows access from resources within the same project, even if they are outside the perimeter.
VPC Service Controls perimeters are designed to prevent data exfiltration by blocking access from networks outside the perimeter, but they explicitly allow access from resources within the same project, even if those resources are not inside the perimeter. In this scenario, the compromised service account was used by a Compute Engine instance running in the same project, so the access was permitted by design. This is a known behavior: VPC Service Controls do not restrict access between resources that share the same Google Cloud project, regardless of whether the requesting resource is inside or outside the perimeter.
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 VPC Service Controls perimeter allows access from resources within the same project, even if they are outside the perimeter.
Why this is correct
VPC Service Controls only block access from outside the perimeter; resources within the same project are considered inside and allowed by default.
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 Cloud KMS key used for encryption was not bound to the perimeter.
Why it's wrong here
CMEK does not affect VPC Service Controls enforcement; it is about encryption, not access control.
- ✗
The Cloud Audit Logs were not enabled for the Cloud Storage bucket, so the access was not logged.
Why it's wrong here
The auditor reviewed logs, so logging was enabled.
- ✗
The VPC Service Controls perimeter was not configured to include the Cloud Storage bucket.
Why it's wrong here
If the bucket is within the perimeter, access from outside is blocked; however, the instance is inside the project, so it might still be allowed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume VPC Service Controls block all cross-resource access within a project, but Cisco tests the specific exception that resources in the same project are always allowed, regardless of perimeter boundaries.
Detailed technical explanation
How to think about this question
VPC Service Controls use a context-aware access model where requests are evaluated against the perimeter's 'access levels' and 'restricted services' list. A key subtlety is that the perimeter does not apply to requests originating from resources within the same project, even if those resources are not in the perimeter's 'allowed' networks. This is because the perimeter is designed to protect data from exfiltration to external networks, not to enforce intra-project isolation. In practice, this means that if a compromised VM in the same project uses a service account with appropriate IAM permissions, it can still access protected resources, as seen here.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Ensuring data protection — study guide chapter
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FAQ
Questions learners often ask
What does this PCSE question test?
Ensuring data protection — This question tests Ensuring data protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The VPC Service Controls perimeter allows access from resources within the same project, even if they are outside the perimeter. — VPC Service Controls perimeters are designed to prevent data exfiltration by blocking access from networks outside the perimeter, but they explicitly allow access from resources within the same project, even if those resources are not inside the perimeter. In this scenario, the compromised service account was used by a Compute Engine instance running in the same project, so the access was permitted by design. This is a known behavior: VPC Service Controls do not restrict access between resources that share the same Google Cloud project, regardless of whether the requesting resource is inside or outside the perimeter.
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.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More PCSE practice questions
- Match each IAM role to its typical use case.
- Match each encryption scope to its description.
- Match each CVE or security concept to its description.
- Match each Google Cloud logging/monitoring term to its definition.
- Drag and drop the steps to rotate a customer-managed encryption key (CMEK) in Cloud KMS in the correct order.
- Drag and drop the steps to configure a Cloud NAT for private VM instances in the correct order.
Last reviewed: Jun 11, 2026
This PCSE 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 PCSE exam.
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