- A
Do not use VPC Service Controls; instead, rely on IAM permissions and firewall rules to control access
Why wrong: IAM and firewalls do not prevent data exfiltration to external IPs outside the perimeter.
- B
Add the project to a VPC Service Controls perimeter and configure an ingress rule to allow traffic from the on-premises VPN CIDR ranges
Ingress rules allow specific external sources (like VPN CIDR) to access the perimeter.
- C
Create a separate perimeter that denies all traffic and apply it to the project
Why wrong: This would deny all access, including from VPN.
- D
Add the project to a VPC Service Controls perimeter with no additional ingress rules
Why wrong: This would block access from on-premises via VPN because VPN traffic originates outside the perimeter.
Quick Answer
The answer is to add the project to a VPC Service Controls perimeter and configure an ingress rule allowing traffic from the on-premises VPN CIDR ranges. This configuration is correct because VPC Service Controls create a security boundary that blocks data exfiltration to external IP addresses, while the ingress rule explicitly permits authorized traffic from the VPN, ensuring internal users retain access to Cloud Storage and BigQuery. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding of how VPC-SC perimeters interact with hybrid connectivity—a common trap is assuming a VPN alone bypasses the perimeter, but without an explicit ingress rule, all traffic, including VPN traffic, is denied. The key distinction is that VPC-SC controls are identity-agnostic and IP-based, so you must authorize the on-premises CIDR ranges as a trusted source. Remember the memory tip: “VPN in, exfil out—ingress rules let the good traffic in while the perimeter keeps the bad out.”
PCSE Practice Question: Managing operations in a cloud solution environment
This PCSE practice question tests your understanding of managing operations in a cloud solution environment. 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.
A security engineer is configuring VPC Service Controls to protect a Google Cloud project containing sensitive data. The project uses Cloud Storage and BigQuery. The engineer wants to ensure that data cannot be exfiltrated to external IP addresses outside the perimeter, but internal users should still be able to access the data from on-premises via a VPN. Which configuration should be applied?
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
Add the project to a VPC Service Controls perimeter and configure an ingress rule to allow traffic from the on-premises VPN CIDR ranges
VPC Service Controls (VPC-SC) allow you to define a security perimeter around Google Cloud services like Cloud Storage and BigQuery, preventing data exfiltration to external IPs. By adding the project to a perimeter and configuring an ingress rule that permits traffic from the on-premises VPN CIDR ranges, internal users can access the data via VPN while all other external traffic is blocked. This meets the requirement of preventing exfiltration to external IPs while allowing authorized on-premises 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.
- ✗
Do not use VPC Service Controls; instead, rely on IAM permissions and firewall rules to control access
Why it's wrong here
IAM and firewalls do not prevent data exfiltration to external IPs outside the perimeter.
- ✓
Add the project to a VPC Service Controls perimeter and configure an ingress rule to allow traffic from the on-premises VPN CIDR ranges
- ✗
Create a separate perimeter that denies all traffic and apply it to the project
Why it's wrong here
This would deny all access, including from VPN.
- ✗
Add the project to a VPC Service Controls perimeter with no additional ingress rules
Why it's wrong here
This would block access from on-premises via VPN because VPN traffic originates outside the perimeter.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that VPC Service Controls are a simple on/off switch, but the trap here is that without explicit ingress rules, all external traffic (including from VPNs) is denied, so candidates must remember to configure ingress rules for authorized sources.
Detailed technical explanation
How to think about this question
VPC Service Controls use context-aware access policies that evaluate attributes like source IP ranges (CIDR blocks) and identity to allow or deny traffic at the service level, not just the network level. Ingress rules in VPC-SC are evaluated before egress rules, so a properly configured ingress rule for the VPN CIDR ensures that traffic from on-premises is allowed into the perimeter, while all other external traffic is denied by the default egress rule. This mechanism works independently of firewall rules and IAM, providing a defense-in-depth approach against data exfiltration.
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
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FAQ
Questions learners often ask
What does this PCSE question test?
Managing operations in a cloud solution environment — This question tests Managing operations in a cloud solution environment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add the project to a VPC Service Controls perimeter and configure an ingress rule to allow traffic from the on-premises VPN CIDR ranges — VPC Service Controls (VPC-SC) allow you to define a security perimeter around Google Cloud services like Cloud Storage and BigQuery, preventing data exfiltration to external IPs. By adding the project to a perimeter and configuring an ingress rule that permits traffic from the on-premises VPN CIDR ranges, internal users can access the data via VPN while all other external traffic is blocked. This meets the requirement of preventing exfiltration to external IPs while allowing authorized on-premises access.
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.
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 →
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Last reviewed: Jun 30, 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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