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.
Exhibit
Hub VNet address space: 10.20.0.0/16
Spoke VNet address space: 10.20.1.0/24
Planned action: Create VNet peering between Hub and Spoke
Portal message: The address spaces overlap and cannot be peered.
Based on the exhibit, what should the administrator do so the hub and spoke can be peered successfully?
Hub VNet address space: 10.20.0.0/16
Spoke VNet address space: 10.20.1.0/24
Planned action: Create VNet peering between Hub and Spoke
Portal message: The address spaces overlap and cannot be peered.
A
Keep the current ranges and enable gateway transit on the peering.
Why wrong: Gateway transit helps shared routing through a gateway, but it does not fix overlapping address spaces.
B
Change the spoke VNet to a non-overlapping address space.
Azure VNet peering requires unique, non-overlapping IP ranges. Changing the spoke to a different CIDR block resolves the conflict and allows the peering to be created.
C
Add another subnet inside the spoke VNet and reuse the current address space.
Why wrong: Adding more subnets does not remove overlap. The entire VNet address space still conflicts with the hub network.
D
Create a network security group on the spoke subnet before peering.
Why wrong: NSGs control traffic filtering, but they do not affect whether two virtual networks can be peered.
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 space.
VNet peering requires that the address spaces of the peered VNets do not overlap. Overlapping IP ranges cause routing conflicts and prevent successful peering. Changing the spoke VNet to a non-overlapping address space resolves this issue and allows the peering to be established.
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.
✗
Keep the current ranges and enable gateway transit on the peering.
Why it's wrong here
Gateway transit helps shared routing through a gateway, but it does not fix overlapping address spaces.
✓
Change the spoke VNet to a non-overlapping address space.
Why this is correct
Azure VNet peering requires unique, non-overlapping IP ranges. Changing the spoke to a different CIDR block resolves the conflict and allows the peering to be created.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add another subnet inside the spoke VNet and reuse the current address space.
Why it's wrong here
Adding more subnets does not remove overlap. The entire VNet address space still conflicts with the hub network.
✗
Create a network security group on the spoke subnet before peering.
Why it's wrong here
NSGs control traffic filtering, but they do not affect whether two virtual networks can be peered.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think overlapping subnets can be worked around by using NSGs or gateway transit, but Azure VNet peering strictly requires non-overlapping VNet address spaces at the time of peering creation.
Detailed technical explanation
How to think about this question
Azure VNet peering uses the underlying Azure backbone to route traffic between VNets. When address spaces overlap, the Azure platform cannot uniquely determine which VNet a packet should be delivered to, leading to routing failures. This is enforced at the VNet address space level, not at the subnet level, so even if subnets are unique, overlapping VNet ranges will block peering. In real-world scenarios, overlapping ranges often occur when merging networks from different organizations or during IP address planning errors.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
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 space. — VNet peering requires that the address spaces of the peered VNets do not overlap. Overlapping IP ranges cause routing conflicts and prevent successful peering. Changing the spoke VNet to a non-overlapping address space resolves this issue and allows the peering to be established.
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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Question Discussion
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