- A
10.1.0.0/16
This overlaps with 10.0.0.0/8.
- B
192.168.0.0/16
Why wrong: This range does not overlap with 10.0.0.0/8.
- C
10.0.0.0/8
Why wrong: This directly overlaps, but the question asks for a range to avoid; 10.1.0.0/16 is a subset.
- D
172.16.0.0/12
Why wrong: This range does not overlap with 10.0.0.0/8.
Question 682 of 982
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.
An organization wants to design IP addresses for their GCP VPC that will be peered with an on-premises network using 10.0.0.0/8. Which subnet IP range should they avoid to prevent overlap?
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
✓
10.1.0.0/16
Option A (10.1.0.0/16) is correct because the on-premises network uses 10.0.0.0/8, which encompasses all IPs from 10.0.0.0 to 10.255.255.255. The subnet 10.1.0.0/16 falls entirely within this range, so peering would cause an IP address overlap, breaking routing between the VPC and on-premises. GCP VPC peering requires non-overlapping CIDR blocks to avoid conflicts.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
10.1.0.0/16
Why this is correct
This overlaps with 10.0.0.0/8.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
192.168.0.0/16
Why it's wrong here
This range does not overlap with 10.0.0.0/8.
- ✗
10.0.0.0/8
Why it's wrong here
This directly overlaps, but the question asks for a range to avoid; 10.1.0.0/16 is a subset.
- ✗
172.16.0.0/12
Why it's wrong here
This range does not overlap with 10.0.0.0/8.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume only exact CIDR matches cause overlap, but any subnet that is a subset of the on-premises range (like 10.1.0.0/16 within 10.0.0.0/8) also overlaps and must be avoided.
Detailed technical explanation
How to think about this question
In GCP, VPC peering uses a flat routing model where routes are exchanged automatically; overlapping subnets cause the peering connection to fail or create asymmetric routing. The 10.0.0.0/8 range is a Class A private block, and any subnet within it (e.g., 10.1.0.0/16) is a subset that will conflict. A real-world scenario is when an organization uses 10.0.0.0/8 on-premises and tries to create a VPC with 10.0.0.0/16, thinking it is small enough, but it still overlaps because the on-premises range is larger.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 10.1.0.0/16 — Option A (10.1.0.0/16) is correct because the on-premises network uses 10.0.0.0/8, which encompasses all IPs from 10.0.0.0 to 10.255.255.255. The subnet 10.1.0.0/16 falls entirely within this range, so peering would cause an IP address overlap, breaking routing between the VPC and on-premises. GCP VPC peering requires non-overlapping CIDR blocks to avoid conflicts.
What should I do if I get this PCNE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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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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