- A
Configure a Cloud Armor security policy to block requests to Cloud Storage from non-VPC IPs.
Why wrong: Cloud Armor protects HTTP(S) load balancers, not Cloud Storage APIs directly.
- B
Create a firewall rule that denies all egress traffic from the VPC to Cloud Storage IP ranges except through a proxy VM.
Why wrong: Cloud Storage API traffic goes to googleapis.com, which resolves to many IPs; managing static IP ranges is impractical and not recommended.
- C
Create a VPC Service Controls service perimeter with an ingress rule that allows access from the VPC network.
This approach restricts access to Cloud Storage from outside the perimeter and allows only requests originating from the specified VPC.
- D
Use IAM conditions on the Cloud Storage bucket to restrict access based on VPC network tags.
Why wrong: IAM conditions cannot restrict access based on VPC network; they can use source IP, but not VPC tags.
PCSE Configuring Network Security Practice Question
This PCSE practice question tests your understanding of configuring network 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 engineer wants to restrict access to Cloud Storage buckets such that only workloads running on Compute Engine VMs in a specific VPC can read data. The VMs are managed by multiple GKE clusters and autoscaling instance groups. Which approach BEST enforces this restriction?
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
Create a VPC Service Controls service perimeter with an ingress rule that allows access from the VPC network.
Use VPC Service Controls to create a service perimeter around the Cloud Storage API, with an ingress rule allowing requests from the specific VPC (using VPC network source) and VMs using the appropriate service accounts. VPC Service Controls prevent data exfiltration by restricting access to Google-managed services from 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.
- ✗
Configure a Cloud Armor security policy to block requests to Cloud Storage from non-VPC IPs.
Why it's wrong here
Cloud Armor protects HTTP(S) load balancers, not Cloud Storage APIs directly.
- ✗
Create a firewall rule that denies all egress traffic from the VPC to Cloud Storage IP ranges except through a proxy VM.
Why it's wrong here
Cloud Storage API traffic goes to googleapis.com, which resolves to many IPs; managing static IP ranges is impractical and not recommended.
- ✓
Create a VPC Service Controls service perimeter with an ingress rule that allows access from the VPC network.
Why this is correct
This approach restricts access to Cloud Storage from outside the perimeter and allows only requests originating from the specified VPC.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use IAM conditions on the Cloud Storage bucket to restrict access based on VPC network tags.
Why it's wrong here
IAM conditions cannot restrict access based on VPC network; they can use source IP, but not VPC tags.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 PCSE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
- →
Configuring Network Security — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this PCSE question test?
Configuring Network Security — This question tests Configuring Network Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a VPC Service Controls service perimeter with an ingress rule that allows access from the VPC network. — Use VPC Service Controls to create a service perimeter around the Cloud Storage API, with an ingress rule allowing requests from the specific VPC (using VPC network source) and VMs using the appropriate service accounts. VPC Service Controls prevent data exfiltration by restricting access to Google-managed services from outside the perimeter.
What should I do if I get this PCSE question wrong?
Identify which PCSE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Jul 4, 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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