- A
Enable gateway transit on the hub and retry the peering.
Why wrong: Gateway transit helps spokes use a hub gateway, but it does not resolve overlapping address spaces.
- B
Add a route table to the spoke subnet so the networks can communicate.
Why wrong: User-defined routes affect packet forwarding after connectivity exists; they do not fix overlapping CIDR blocks.
- C
Change the spoke VNet address space to a non-overlapping range, then recreate or update peering.
VNet peering requires the two virtual networks to have non-overlapping IP address spaces. Because the hub already uses 10.20.0.0/16, the spoke cannot use 10.20.1.0/24. The administrator must renumber the spoke to a different range, such as 10.21.0.0/16 or another approved block, before peering can succeed.
- D
Configure a custom DNS server in the spoke to translate the overlapping range.
Why wrong: DNS can help name resolution, but it cannot make overlapping network ranges eligible for peering.
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 peer a new spoke virtual network with an existing hub VNet. The hub uses 10.20.0.0/16. The spoke was created with 10.20.1.0/24 because that range was still available in the IPAM spreadsheet. VNet peering creation fails. What should the administrator do first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
Change the spoke VNet address space to a non-overlapping range, then recreate or update peering.
VNet peering in Azure requires that the address spaces of the peered virtual networks do not overlap. The hub uses 10.20.0.0/16, and the spoke uses 10.20.1.0/24, which is a subset of the hub's range. This overlap causes the peering creation to fail. The administrator must first change the spoke's address space to a non-overlapping range (e.g., 10.21.0.0/24) and then recreate or update the peering.
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.
- ✗
Enable gateway transit on the hub and retry the peering.
Why it's wrong here
Gateway transit helps spokes use a hub gateway, but it does not resolve overlapping address spaces.
- ✗
Add a route table to the spoke subnet so the networks can communicate.
Why it's wrong here
User-defined routes affect packet forwarding after connectivity exists; they do not fix overlapping CIDR blocks.
- ✓
Change the spoke VNet address space to a non-overlapping range, then recreate or update peering.
Why this is correct
VNet peering requires the two virtual networks to have non-overlapping IP address spaces. Because the hub already uses 10.20.0.0/16, the spoke cannot use 10.20.1.0/24. The administrator must renumber the spoke to a different range, such as 10.21.0.0/16 or another approved block, before peering can succeed.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure a custom DNS server in the spoke to translate the overlapping range.
Why it's wrong here
DNS can help name resolution, but it cannot make overlapping network ranges eligible for peering.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think overlapping address spaces can be resolved by routing or DNS changes, but Azure explicitly prohibits peering with overlapping ranges, and no configuration workaround exists—the address space must be changed.
Detailed technical explanation
How to think about this question
Azure VNet peering requires that the address spaces of both VNets be unique and non-overlapping, as per the Azure Resource Manager constraints. When a spoke uses a subnet (10.20.1.0/24) that falls within the hub's larger range (10.20.0.0/16), Azure detects the conflict and rejects the peering request at the control plane level. In a real-world scenario, IPAM spreadsheets often lead to such errors because they may not enforce hierarchical allocation; the fix involves either renumbering the spoke or using a different address space entirely, such as 10.21.0.0/16, to ensure no overlap.
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.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this AZ-104 question test?
Implement and Manage Virtual Networking — This question tests Implement and Manage Virtual Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Change the spoke VNet address space to a non-overlapping range, then recreate or update peering. — VNet peering in Azure requires that the address spaces of the peered virtual networks do not overlap. The hub uses 10.20.0.0/16, and the spoke uses 10.20.1.0/24, which is a subset of the hub's range. This overlap causes the peering creation to fail. The administrator must first change the spoke's address space to a non-overlapping range (e.g., 10.21.0.0/24) and then recreate or update the peering.
What should I do if I get this AZ-104 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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: Jun 11, 2026
This AZ-104 practice question is part of Courseiva's free Microsoft 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 AZ-104 exam.
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