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.
Two application teams created separate virtual networks so their workloads can communicate through VNet peering. VNet-A uses 10.20.0.0/16. VNet-B was created with 10.20.128.0/17. The peering request fails during validation. What is the best fix?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Change one VNet to use a non-overlapping address space.
VNet peering requires that the address spaces of the peered virtual networks do not overlap. VNet-A uses 10.20.0.0/16, which includes the entire range from 10.20.0.0 to 10.20.255.255. VNet-B uses 10.20.128.0/17, which is a subset of VNet-A's range (10.20.128.0 to 10.20.255.255). This overlap causes the peering validation to fail because Azure cannot route traffic between overlapping address spaces. Changing one VNet to a non-overlapping address space resolves the conflict.
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 an NSG rule to allow traffic between the two VNets.
Why it's wrong here
NSGs control packet filtering, but they do not resolve overlapping address spaces during peering creation.
✓
Change one VNet to use a non-overlapping address space.
Why this is correct
VNet peering requires non-overlapping IP ranges. Readdressing one VNet removes the conflict and allows peering to be created.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a private endpoint in each VNet.
Why it's wrong here
Private endpoints help reach PaaS services privately, but they do not solve VNet-to-VNet address conflicts.
✗
Attach a route table to both subnets.
Why it's wrong here
Route tables affect traffic forwarding, but peering still fails if the address spaces overlap.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think NSG rules or route tables can fix connectivity issues between peered VNets, but the peering validation itself fails due to overlapping address spaces, which is a fundamental design constraint that cannot be overridden by network security or routing policies.
Detailed technical explanation
How to think about this question
Azure VNet peering uses the underlying Azure backbone and relies on the virtual network's address space to build routing entries. When address spaces overlap, the Azure platform cannot create unique routes for each VNet, leading to ambiguous routing and a validation failure. This is enforced at the control plane during peering setup, not at the data plane, so no amount of NSG or UDR configuration can bypass it. In real-world scenarios, overlapping address spaces often occur when teams independently choose RFC 1918 ranges without coordination, requiring a redesign or the use of network address translation (NAT) or a hub-spoke topology with overlapping ranges isolated by firewalls.
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 one VNet to use a non-overlapping address space. — VNet peering requires that the address spaces of the peered virtual networks do not overlap. VNet-A uses 10.20.0.0/16, which includes the entire range from 10.20.0.0 to 10.20.255.255. VNet-B uses 10.20.128.0/17, which is a subset of VNet-A's range (10.20.128.0 to 10.20.255.255). This overlap causes the peering validation to fail because Azure cannot route traffic between overlapping address spaces. Changing one VNet to a non-overlapping address space resolves the conflict.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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