- A
Create a Cloud Router to advertise routes to Google.
Why wrong: Cloud Router is not needed for Private Google Access.
- B
Create a subnet with the --enable-private-ip-google-access flag.
Private Google Access must be enabled on the subnet.
- C
Create a VPC network.
A VPC network is needed to host the subnet.
- D
Launch Compute Engine instances in the subnet.
Instances must be in the subnet to use Private Google Access.
- E
Configure Cloud NAT to route traffic to Google APIs.
Why wrong: Cloud NAT is for internet access, not for Private Google Access.
Question 873 of 1,000
Google ACE Configuring Access and Security Practice Question
This ACE practice question tests your understanding of configuring access and security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Which THREE configurations are required to enable Private Google Access for Compute Engine instances in a custom VPC subnet? (Select 3 correct answers)
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 subnet with the --enable-private-ip-google-access flag.
Private Google Access is enabled on a subnet. Instances in that subnet can reach Google APIs using internal IPs. It does not require Cloud NAT, Cloud VPN, or internet access. The three required elements are: a VPC network, a subnet with Private Google Access enabled, and instances in that subnet.
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.
- ✗
Create a Cloud Router to advertise routes to Google.
Why it's wrong here
Cloud Router is not needed for Private Google Access.
- ✓
Create a subnet with the --enable-private-ip-google-access flag.
Why this is correct
Private Google Access must be enabled on the subnet.
Related concept
CIDR notation defines the prefix length.
- ✓
Create a VPC network.
Why this is correct
A VPC network is needed to host the subnet.
Related concept
CIDR notation defines the prefix length.
- ✓
Launch Compute Engine instances in the subnet.
Why this is correct
Instances must be in the subnet to use Private Google Access.
Related concept
CIDR notation defines the prefix length.
- ✗
Configure Cloud NAT to route traffic to Google APIs.
Why it's wrong here
Cloud NAT is for internet access, not for Private Google Access.
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.
- →
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: Create a subnet with the --enable-private-ip-google-access flag. — Private Google Access is enabled on a subnet. Instances in that subnet can reach Google APIs using internal IPs. It does not require Cloud NAT, Cloud VPN, or internet access. The three required elements are: a VPC network, a subnet with Private Google Access enabled, and instances in that subnet.
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.
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Last reviewed: Jul 4, 2026
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