- A
Create a route table on the spoke subnet before adding the peering.
Why wrong: A route table does not resolve overlapping address spaces, so peering would still fail.
- B
Change the spoke VNet address space to a range that does not overlap the hub.
Azure virtual network peering requires non-overlapping IP address spaces on both sides. Because the spoke is using 10.40.1.0/24, which sits inside the hub's 10.40.0.0/16 range, peering cannot be created successfully. The administrator must renumber the spoke to a unique range before attempting the peering, then update any dependent subnet and DNS settings as needed.
- C
Enable gateway transit on the hub peering to permit overlapping spaces.
Why wrong: Gateway transit helps share a gateway, but it does not allow overlapping IP ranges between VNets.
- D
Add an NSG rule that allows traffic between the hub and spoke address spaces.
Why wrong: Network security groups filter traffic, but they do not make overlapping CIDR ranges valid 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 created a new spoke virtual network with the address space 10.40.1.0/24. The existing hub virtual network already uses 10.40.0.0/16. The administrator must peer the two VNets so resources can communicate normally. What must be changed before peering can succeed?
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 range that does not overlap the hub.
Azure Virtual Network peering requires that the address spaces of the peered VNets do not overlap. The hub VNet uses 10.40.0.0/16, which includes the spoke's 10.40.1.0/24 range. Overlapping address spaces prevent successful peering because Azure cannot route traffic correctly between overlapping IP ranges. Therefore, the spoke VNet address space must be changed to a non-overlapping range before peering can 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.
- ✗
Create a route table on the spoke subnet before adding the peering.
Why it's wrong here
A route table does not resolve overlapping address spaces, so peering would still fail.
- ✓
Change the spoke VNet address space to a range that does not overlap the hub.
Why this is correct
Azure virtual network peering requires non-overlapping IP address spaces on both sides. Because the spoke is using 10.40.1.0/24, which sits inside the hub's 10.40.0.0/16 range, peering cannot be created successfully. The administrator must renumber the spoke to a unique range before attempting the peering, then update any dependent subnet and DNS settings as needed.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable gateway transit on the hub peering to permit overlapping spaces.
Why it's wrong here
Gateway transit helps share a gateway, but it does not allow overlapping IP ranges between VNets.
- ✗
Add an NSG rule that allows traffic between the hub and spoke address spaces.
Why it's wrong here
Network security groups filter traffic, but they do not make overlapping CIDR ranges valid for peering.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse overlapping address spaces with connectivity issues that can be fixed by routing or security rules, but Azure strictly prohibits overlapping address spaces for VNet peering at the control plane level.
Detailed technical explanation
How to think about this question
Azure VNet peering relies on the underlying Azure backbone routing infrastructure, which uses the VNet address spaces to build a routing table. When address spaces overlap, the routing table entries conflict, causing Azure to reject the peering request with an error. This is enforced at the control plane level during peering creation, not at the data plane, so no amount of routing or security configuration can bypass it. In real-world scenarios, overlapping address spaces often occur when merging networks from acquisitions or connecting on-premises environments, requiring careful IP address planning or NAT solutions.
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
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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 range that does not overlap the hub. — Azure Virtual Network peering requires that the address spaces of the peered VNets do not overlap. The hub VNet uses 10.40.0.0/16, which includes the spoke's 10.40.1.0/24 range. Overlapping address spaces prevent successful peering because Azure cannot route traffic correctly between overlapping IP ranges. Therefore, the spoke VNet address space must be changed to a non-overlapping range before peering can 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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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