- A
VPC Service Controls
VPC Service Controls creates perimeters that restrict data movement across projects and networks.
- B
Cloud Armor
Why wrong: Cloud Armor provides DDoS protection and WAF, not access perimeters.
- C
Cloud NAT
Why wrong: Cloud NAT provides outbound internet access, not access restriction.
- D
VPC firewall rules
Why wrong: Firewall rules control IP traffic, not API-level access to Cloud Storage.
Question 10 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.
A company has a VPC with multiple subnets and wants to prevent data exfiltration by restricting access to a Cloud Storage bucket from only resources within a defined perimeter. Which Google Cloud service should they use to create an API perimeter around the bucket?
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
VPC Service Controls allows you to define perimeters around Google Cloud services like Cloud Storage, preventing data exfiltration to networks outside the perimeter. VPC firewall rules control network traffic but not API access. Cloud Armor is for DDoS protection. Cloud NAT is for outbound internet access.
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.
- ✓
VPC Service Controls
Why this is correct
VPC Service Controls creates perimeters that restrict data movement across projects and networks.
Related concept
CIDR notation defines the prefix length.
- ✗
Cloud Armor
Why it's wrong here
Cloud Armor provides DDoS protection and WAF, not access perimeters.
- ✗
Cloud NAT
Why it's wrong here
Cloud NAT provides outbound internet access, not access restriction.
- ✗
VPC firewall rules
Why it's wrong here
Firewall rules control IP traffic, not API-level access 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.
Visual reference
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.
- →
Google Cloud Security — study guide chapter
Learn the concepts, then practise the questions
- →
Google Cloud Security practice questions
Targeted practice on this topic area only
- →
All GCDL questions
1,000 questions across all exam domains
- →
Google Cloud Digital Leader study guide
Full concept coverage aligned to exam objectives
- →
GCDL practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related GCDL practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Why Cloud Technology Can Transform Business practice questions
Practise GCDL questions linked to Why Cloud Technology Can Transform Business.
Fundamental Cloud Concepts practice questions
Practise GCDL questions linked to Fundamental Cloud Concepts.
Google Cloud Security practice questions
Practise GCDL questions linked to Google Cloud Security.
How Google Cloud Resources Are Managed practice questions
Practise GCDL questions linked to How Google Cloud Resources Are Managed.
Google Cloud Products and Services practice questions
Practise GCDL questions linked to Google Cloud Products and Services.
Why cloud technology is transforming business practice questions
Practise GCDL questions linked to Why cloud technology is transforming business.
Google Cloud products, services, and solutions practice questions
Practise GCDL questions linked to Google Cloud products, services, and solutions.
Scaling with Google Cloud operations practice questions
Practise GCDL questions linked to Scaling with Google Cloud operations.
Trust and security with Google Cloud practice questions
Practise GCDL questions linked to Trust and security with Google Cloud.
GCDL fundamentals practice questions
Practise GCDL questions linked to GCDL fundamentals.
GCDL scenario practice questions
Practise GCDL questions linked to GCDL scenario.
GCDL troubleshooting practice questions
Practise GCDL questions linked to GCDL troubleshooting.
Practice this exam
Start a free GCDL practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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: VPC Service Controls — VPC Service Controls allows you to define perimeters around Google Cloud services like Cloud Storage, preventing data exfiltration to networks outside the perimeter. VPC firewall rules control network traffic but not API access. Cloud Armor is for DDoS protection. Cloud NAT is for outbound internet access.
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
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 →
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.