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ACE Practice Question: A network team is creating a new VPC and must…
This ACE practice question tests your understanding of a network team is creating a new vpc and must…. 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 network team is creating a new VPC and must decide between auto mode and custom mode. Why would they choose custom mode?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Custom mode allows full control over which regions have subnets and what CIDR ranges are used
In custom mode, the team creates subnets explicitly, choosing regions and CIDRs. This avoids CIDR conflicts with on-premises networks and prevents unnecessary subnet sprawl.
B
Distractor review
Auto mode VPCs cannot be used with GKE clusters
GKE clusters can be deployed in both auto mode and custom mode VPCs.
C
Distractor review
Custom mode VPCs support more IP addresses per subnet than auto mode
The VPC mode doesn't restrict subnet IP capacity — both modes support the same CIDR sizes.
D
Distractor review
Auto mode VPCs cost more per subnet than custom mode
VPC networking costs are based on traffic and peering, not the VPC mode — auto and custom mode have the same pricing structure.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
Related ACE practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
What is the correct order of the Google Cloud resource hierarchy from highest to lowest level?
Question 2
A compliance archive stores legal documents accessed at most once per quarter. Which Cloud Storage class minimizes storage cost while meeting that access pattern?
Question 3
Which gcloud command creates a Compute Engine VM named 'web-01' using the e2-medium machine type in zone us-central1-a?
Question 4
A team wants to receive an email alert when the average CPU utilization of VMs in a managed instance group exceeds 80% for more than 5 minutes. What should they create in Cloud Monitoring?
Question 5
A junior developer needs read-only access to all GCP resources in a project. Which IAM role grants the minimum permissions required?
Question 6
A startup creates its first Google Cloud project. Before deploying any paid resources, what must be linked to the project?
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FAQ
Questions learners often ask
What does this ACE question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: Custom mode allows full control over which regions have subnets and what CIDR ranges are used — Custom mode VPCs give full control over subnet creation — which regions get subnets, what CIDR ranges they use, and when they are created. Auto mode creates one subnet per region automatically, using predetermined CIDRs (10.128.x.x/20) that may conflict with on-premises networks. For enterprise or production environments, custom mode is the standard recommendation.
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.
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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.