- A
Firewall rule allowing ingress tcp:22 from the bastion host's subnet
Allows SSH access from the bastion.
- B
Bastion host with an external IP address
The bastion host needs an external IP to be reachable from the internet, or it can be in a public subnet with a firewall rule allowing SSH.
- C
Cloud Router with BGP session
Why wrong: Cloud Router is needed for Cloud NAT, but the question asks for components, and Cloud NAT includes a Cloud Router. However, Cloud Router alone does not provide internet access. Typically, you create a Cloud Router and then a Cloud NAT on it.
- D
Cloud NAT gateway
Enables outbound internet for private instances.
- E
VPC peering with the internet
Why wrong: VPC peering is for connecting VPCs, not internet access.
Question 74 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.
An organization is designing a VPC with multiple subnets. They want instances in a private subnet to access the internet for updates. They also need to allow SSH access from a bastion host. Which THREE components must they configure? (Choose 3 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
✓
Firewall rule allowing ingress tcp:22 from the bastion host's subnet
To allow outbound internet access from private instances, you need a Cloud NAT gateway. To allow inbound SSH from a bastion host, you need firewall rules allowing SSH from the bastion's IP range. The bastion host must be in a different subnet with an external IP or a Cloud NAT as well.
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.
- ✓
Firewall rule allowing ingress tcp:22 from the bastion host's subnet
- ✓
Bastion host with an external IP address
- ✗
Cloud Router with BGP session
Why it's wrong here
Cloud Router is needed for Cloud NAT, but the question asks for components, and Cloud NAT includes a Cloud Router. However, Cloud Router alone does not provide internet access. Typically, you create a Cloud Router and then a Cloud NAT on it.
- ✓
Cloud NAT gateway
Why this is correct
Enables outbound internet for private instances.
Related concept
CIDR notation defines the prefix length.
- ✗
VPC peering with the internet
Why it's wrong here
VPC peering is for connecting VPCs, not internet 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: Firewall rule allowing ingress tcp:22 from the bastion host's subnet — To allow outbound internet access from private instances, you need a Cloud NAT gateway. To allow inbound SSH from a bastion host, you need firewall rules allowing SSH from the bastion's IP range. The bastion host must be in a different subnet with an external IP or a Cloud NAT as well.
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
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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