- A
Create a Cloud NAT gateway.
Why wrong: Cloud NAT is for internet access, not required for Google APIs.
- B
Add a firewall rule allowing egress to 0.0.0.0/0.
Why wrong: Default egress rule exists; not needed.
- C
Assign the instances a network tag.
Why wrong: Not required for Private Google Access.
- D
Ensure the subnet has a default route (0.0.0.0/0) to the default internet gateway.
Needed for routing traffic to Google APIs.
- E
Enable Private Google Access on the subnet using --enable-private-ip-google-access.
Required to allow internal-only instances to reach Google APIs.
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.
A company needs to enable Private Google Access for a subnet in a VPC so that Compute Engine instances without external IPs can access Google APIs and services. Which two steps are required? (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
Ensure the subnet has a default route (0.0.0.0/0) to the default internet gateway.
Private Google Access is enabled at the subnet level using '--enable-private-ip-google-access' flag. Additionally, to access non-Google APIs on the internet, Cloud NAT is required. But for Google APIs, Cloud NAT is not necessary. However, the question may imply accessing both, but typically only subnet setting is needed. In this scenario, the two steps are: enable Private Google Access on the subnet, and create a Cloud NAT if they need to access the internet (non-Google). Since the question says 'Google APIs and services', Cloud NAT is not required. But the option might be considered if they need to access other services. Let's check the correct answer: The definitive steps: enable Private Google Access on the subnet (option A) and ensure the subnet has a default route to the internet gateway (option D) because even for Google APIs, traffic needs a default route? Actually, for Private Google Access, the default route is automatically created? The default VPC has a default route. If not, you need one. Let's assume the VPC already has default route. The most common two steps: enable subnet setting and ensure DNS resolution. But DNS is not listed. The typical two: enable Private Google Access on subnet and ensure the subnet has a default route. So options A and D.
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 NAT gateway.
Why it's wrong here
Cloud NAT is for internet access, not required for Google APIs.
- ✗
Add a firewall rule allowing egress to 0.0.0.0/0.
Why it's wrong here
Default egress rule exists; not needed.
- ✗
Assign the instances a network tag.
Why it's wrong here
Not required for Private Google Access.
- ✓
Ensure the subnet has a default route (0.0.0.0/0) to the default internet gateway.
Why this is correct
Needed for routing traffic to Google APIs.
Related concept
CIDR notation defines the prefix length.
- ✓
Enable Private Google Access on the subnet using --enable-private-ip-google-access.
Why this is correct
Required to allow internal-only instances to reach Google APIs.
Related concept
CIDR notation defines the prefix length.
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
- →
Configuring Access and Security practice questions
Targeted practice on this topic area only
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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: Ensure the subnet has a default route (0.0.0.0/0) to the default internet gateway. — Private Google Access is enabled at the subnet level using '--enable-private-ip-google-access' flag. Additionally, to access non-Google APIs on the internet, Cloud NAT is required. But for Google APIs, Cloud NAT is not necessary. However, the question may imply accessing both, but typically only subnet setting is needed. In this scenario, the two steps are: enable Private Google Access on the subnet, and create a Cloud NAT if they need to access the internet (non-Google). Since the question says 'Google APIs and services', Cloud NAT is not required. But the option might be considered if they need to access other services. Let's check the correct answer: The definitive steps: enable Private Google Access on the subnet (option A) and ensure the subnet has a default route to the internet gateway (option D) because even for Google APIs, traffic needs a default route? Actually, for Private Google Access, the default route is automatically created? The default VPC has a default route. If not, you need one. Let's assume the VPC already has default route. The most common two steps: enable subnet setting and ensure DNS resolution. But DNS is not listed. The typical two: enable Private Google Access on subnet and ensure the subnet has a default route. So options A and D.
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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