- A
VPC Network Peering
Why wrong: VPC peering requires non-overlapping subnets; overlapping subnets prevent peering.
- B
Cloud VPN with dynamic routing
Why wrong: Cloud VPN also requires non-overlapping ranges for BGP routes.
- C
None of these
GCP does not support direct connectivity between VPCs with overlapping IP ranges. You would need to re-IP one VPC or use NAT/translation.
- D
Shared VPC
Why wrong: Shared VPC attaches service projects to a host VPC; overlapping ranges would conflict within the same VPC.
Question 411 of 1,000
PCNE Practice Question: Designing, Planning, and Prototyping a GCP Network
This PCNE practice question tests your understanding of designing, planning, and prototyping a gcp network. 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 wants to connect two VPCs in different GCP projects so that they can communicate using internal IP addresses. The VPCs have overlapping IP ranges. Which approach allows connectivity without changing existing IP addresses?
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
✓
None of these
VPC Network Peering requires non-overlapping subnets. Shared VPC is for multiple projects using a common VPC. Cloud VPN or Interconnect are hybrid connectivity options but also require non-overlapping IP ranges. None of the options allow overlapping IPs.
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.
- ✗
VPC Network Peering
Why it's wrong here
VPC peering requires non-overlapping subnets; overlapping subnets prevent peering.
- ✗
Cloud VPN with dynamic routing
- ✓
None of these
- ✗
Shared VPC
Why it's wrong here
Shared VPC attaches service projects to a host VPC; overlapping ranges would conflict within the same VPC.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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 PCNE subnetting questions on CIDR, address ranges, and subnet selection.
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Designing, Planning, and Prototyping a GCP Network — study guide chapter
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FAQ
Questions learners often ask
What does this PCNE question test?
Designing, Planning, and Prototyping a GCP Network — This question tests Designing, Planning, and Prototyping a GCP Network — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: None of these — VPC Network Peering requires non-overlapping subnets. Shared VPC is for multiple projects using a common VPC. Cloud VPN or Interconnect are hybrid connectivity options but also require non-overlapping IP ranges. None of the options allow overlapping IPs.
What should I do if I get this PCNE 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 PCNE 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 PCNE 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 PCNE exam.
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