- A
gcloud compute networks subnets create my-subnet --network my-vpc --region us-central1 --range 10.0.0.0/24 --enable-private-ip-google-access
Creates subnet with Private Google Access enabled.
- B
gcloud compute networks create my-vpc --subnet-mode custom
Creates a custom mode VPC.
- C
gcloud compute networks subnets create my-subnet --network my-vpc --region us-central1 --range 10.0.0.0/24
Why wrong: Missing enable flag.
- D
gcloud compute firewall-rules create allow-http --allow tcp:80
Why wrong: Not needed for subnet creation.
- E
gcloud compute networks create my-vpc --subnet-mode auto
Why wrong: Auto mode is not custom.
Question 23 of 1,000
Google ACE Configuring Access and Security Practice Question
This ACE practice question tests your understanding of configuring access and 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 wants to create a VPC with a custom subnet mode and then create a subnet with Private Google Access enabled. Which two commands should they use? (Choose TWO.)
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
✓
gcloud compute networks subnets create my-subnet --network my-vpc --region us-central1 --range 10.0.0.0/24 --enable-private-ip-google-access
To create a custom mode VPC, use 'gcloud compute networks create' with '--subnet-mode custom'. Then add a subnet with 'gcloud compute networks subnets create' including '--enable-private-ip-google-access'. The other commands are incorrect: one creates an auto mode VPC, another is for firewall rules.
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.
- ✓
gcloud compute networks subnets create my-subnet --network my-vpc --region us-central1 --range 10.0.0.0/24 --enable-private-ip-google-access
Why this is correct
Creates subnet with Private Google Access enabled.
Related concept
CIDR notation defines the prefix length.
- ✓
gcloud compute networks create my-vpc --subnet-mode custom
Why this is correct
Creates a custom mode VPC.
Related concept
CIDR notation defines the prefix length.
- ✗
gcloud compute networks subnets create my-subnet --network my-vpc --region us-central1 --range 10.0.0.0/24
Why it's wrong here
Missing enable flag.
- ✗
gcloud compute firewall-rules create allow-http --allow tcp:80
Why it's wrong here
Not needed for subnet creation.
- ✗
gcloud compute networks create my-vpc --subnet-mode auto
Why it's wrong here
Auto mode is not custom.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 ACE subnetting questions on CIDR, address ranges, and subnet selection.
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Configuring Access and Security — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this ACE question test?
Configuring Access and Security — This question tests Configuring Access and Security — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: gcloud compute networks subnets create my-subnet --network my-vpc --region us-central1 --range 10.0.0.0/24 --enable-private-ip-google-access — To create a custom mode VPC, use 'gcloud compute networks create' with '--subnet-mode custom'. Then add a subnet with 'gcloud compute networks subnets create' including '--enable-private-ip-google-access'. The other commands are incorrect: one creates an auto mode VPC, another is for firewall rules.
What should I do if I get this ACE 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 ACE 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 ACE 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 ACE exam.
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