- A
Set an ingress policy to allow access only from the VPC network
Ingress rules specify allowed sources, such as the VPC.
- B
Use IAM conditions to restrict access to the VPC
Why wrong: IAM conditions do not enforce network-level perimeters.
- C
Enable Private Google Access on the VPC subnets
Why wrong: Private Google Access allows VMs to access Google APIs, but does not restrict access from outside.
- D
Create a VPC Service Controls perimeter
Defines a security perimeter around the project's services.
- E
Create a firewall rule that denies all traffic to Cloud Storage
Why wrong: Firewall rules apply to VM instances, not Cloud Storage API.
Question 491 of 1,000
Cloud Digital Leader Google Cloud Security Practice Question
This GCDL practice question tests your understanding of google cloud 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.
An engineer needs to prevent data exfiltration from a project by ensuring that Cloud Storage buckets can only be accessed from within a VPC network. Which TWO steps should they take? (Choose 2)
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
✓
Set an ingress policy to allow access only from the VPC network
Create a VPC Service Controls perimeter that includes the project and restricts access to the VPC, and set ingress rules to allow traffic from the VPC.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Set an ingress policy to allow access only from the VPC network
Why this is correct
Ingress rules specify allowed sources, such as the VPC.
Related concept
CIDR notation defines the prefix length.
- ✗
Use IAM conditions to restrict access to the VPC
Why it's wrong here
IAM conditions do not enforce network-level perimeters.
- ✗
Enable Private Google Access on the VPC subnets
Why it's wrong here
Private Google Access allows VMs to access Google APIs, but does not restrict access from outside.
- ✓
Create a VPC Service Controls perimeter
Why this is correct
Defines a security perimeter around the project's services.
Related concept
CIDR notation defines the prefix length.
- ✗
Create a firewall rule that denies all traffic to Cloud Storage
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related GCDL subnetting questions on CIDR, address ranges, and subnet selection.
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Google Cloud Security — study guide chapter
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FAQ
Questions learners often ask
What does this GCDL question test?
Google Cloud Security — This question tests Google Cloud Security — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Set an ingress policy to allow access only from the VPC network — Create a VPC Service Controls perimeter that includes the project and restricts access to the VPC, and set ingress rules to allow traffic from the VPC.
What should I do if I get this GCDL question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related GCDL subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
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Last reviewed: Jul 4, 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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