- A
Add a route table to the spoke and point the default route to the hub.
Why wrong: Routing cannot fix overlapping address spaces because peering validation fails before route forwarding can matter.
- B
Change the spoke VNet to a non-overlapping address range before attempting peering again.
Azure virtual network peering requires non-overlapping address spaces. The spoke currently sits inside the hub's 10.100.0.0/16 range, so the overlap must be removed first. After the address space is changed to a unique range, peering can succeed and private connectivity can be established.
- C
Enable gateway transit on the hub and use the remote gateway from the spoke.
Why wrong: Gateway transit shares an existing gateway, but it does not override the requirement for non-overlapping VNet address spaces.
- D
Deploy a private DNS zone and link it to both VNets.
Why wrong: Private DNS zones solve name resolution, not address overlap. The peering failure is caused by the IP plan, not by DNS.
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.
An administrator creates a new spoke virtual network with address space 10.100.1.0/24 and tries to peer it to an existing hub virtual network that already uses 10.100.0.0/16. The peering fails. The business wants private connectivity between the hub and spoke. What action should the administrator take 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 to a non-overlapping address range before attempting peering again.
VNet peering requires that the address spaces of the peered virtual networks do not overlap. The hub already uses 10.100.0.0/16, which includes the spoke's 10.100.1.0/24 range, causing a conflict. Changing the spoke to a non-overlapping address range, such as 10.200.1.0/24, resolves this and allows the peering to succeed.
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.
- ✗
Add a route table to the spoke and point the default route to the hub.
Why it's wrong here
Routing cannot fix overlapping address spaces because peering validation fails before route forwarding can matter.
- ✓
Change the spoke VNet to a non-overlapping address range before attempting peering again.
Why this is correct
Azure virtual network peering requires non-overlapping address spaces. The spoke currently sits inside the hub's 10.100.0.0/16 range, so the overlap must be removed first. After the address space is changed to a unique range, peering can succeed and private connectivity can be established.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable gateway transit on the hub and use the remote gateway from the spoke.
Why it's wrong here
Gateway transit shares an existing gateway, but it does not override the requirement for non-overlapping VNet address spaces.
- ✗
Deploy a private DNS zone and link it to both VNets.
Why it's wrong here
Private DNS zones solve name resolution, not address overlap. The peering failure is caused by the IP plan, not by DNS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume routing or DNS configuration can fix peering failures, overlooking the fundamental requirement that VNet address spaces must not overlap.
Detailed technical explanation
How to think about this question
Azure VNet peering uses the underlying Azure backbone to route traffic between VNets, but it enforces strict non-overlapping address space rules at the time of peering creation to prevent routing loops and ambiguity. Overlapping ranges cause the peering operation to fail with an error like 'Address space overlaps with the peered virtual network.' In real-world hub-and-spoke designs, careful IP planning with contiguous but non-overlapping CIDR blocks (e.g., hub /16, spokes /24 from different supernets) is critical to avoid this issue.
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 to a non-overlapping address range before attempting peering again. — VNet peering requires that the address spaces of the peered virtual networks do not overlap. The hub already uses 10.100.0.0/16, which includes the spoke's 10.100.1.0/24 range, causing a conflict. Changing the spoke to a non-overlapping address range, such as 10.200.1.0/24, resolves this and allows the peering to succeed.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 11, 2026
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