- A
Create the peering now and let Azure automatically route overlapping prefixes.
Why wrong: Azure peering does not support overlapping address spaces, even if routing is otherwise correct.
- B
Add a new non-overlapping address space to VNet-B, create replacement subnets there, and migrate workloads gradually.
A second non-overlapping range lets you prepare new subnets and move workloads before removing the conflicting range.
- C
Attach a route table to VNet-B so traffic to VNet-A is forced through a firewall appliance.
Why wrong: Route tables do not solve overlapping IP ranges or make peering between conflicting VNets possible.
- D
Create a private endpoint between the two VNets so Azure ignores the overlap during connectivity checks.
Why wrong: Private endpoints are for PaaS resource access, not for enabling direct VNet-to-VNet 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 has VNet-A with address space 10.20.0.0/16 and active workloads in several subnets. The team must peer VNet-A with VNet-B, but VNet-B currently uses 10.20.128.0/17 and cannot be rebuilt from scratch. What should the administrator do first to make peering possible without interrupting current workloads?
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
Add a new non-overlapping address space to VNet-B, create replacement subnets there, and migrate workloads gradually.
Azure Virtual Network peering requires that the address spaces of the peered VNets do not overlap. VNet-A uses 10.20.0.0/16, which fully contains VNet-B's 10.20.128.0/17, creating an overlap. Since VNet-B cannot be rebuilt, the correct first step is to add a new non-overlapping address space (e.g., 10.30.0.0/16) to VNet-B, create subnets in that new range, migrate workloads gradually, and then remove the overlapping address space before establishing the peering. This ensures no IP conflicts and avoids disrupting existing workloads.
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 the peering now and let Azure automatically route overlapping prefixes.
Why it's wrong here
Azure peering does not support overlapping address spaces, even if routing is otherwise correct.
When this WOULD be correct
If the question described a scenario where both VNets have non-overlapping address spaces but need to exchange routes, and the administrator wants to simplify routing, then creating the peering and letting Azure automatically manage routes (via system routes) would be correct.
- ✓
Add a new non-overlapping address space to VNet-B, create replacement subnets there, and migrate workloads gradually.
Why this is correct
A second non-overlapping range lets you prepare new subnets and move workloads before removing the conflicting range.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Attach a route table to VNet-B so traffic to VNet-A is forced through a firewall appliance.
Why it's wrong here
Route tables do not solve overlapping IP ranges or make peering between conflicting VNets possible.
When this WOULD be correct
If the question involved controlling traffic flow between peered VNets (e.g., to inspect or filter traffic), attaching a route table with a firewall appliance would be correct to enforce routing policies.
- ✗
Create a private endpoint between the two VNets so Azure ignores the overlap during connectivity checks.
Why it's wrong here
Private endpoints are for PaaS resource access, not for enabling direct VNet-to-VNet peering.
When this WOULD be correct
When you need to connect to an Azure PaaS service (e.g., Storage, SQL Database) from a VNet without exposing it to the public internet, and you want the traffic to stay within the Microsoft backbone.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓Add a new non-overlapping address space to VNet-B, create replacement subnets there, and migrate workloads gradually.Correct answer▾
Why this is correct
A second non-overlapping range lets you prepare new subnets and move workloads before removing the conflicting range.
✗Create the peering now and let Azure automatically route overlapping prefixes.Wrong answer — click to see why▾
Why this is wrong here
Azure does not automatically route overlapping prefixes; overlapping address spaces prevent VNet peering from being established. Creating the peering without resolving the overlap will fail.
★ When this WOULD be the correct answer
If the question described a scenario where both VNets have non-overlapping address spaces but need to exchange routes, and the administrator wants to simplify routing, then creating the peering and letting Azure automatically manage routes (via system routes) would be correct.
Why candidates choose this
Candidates may mistakenly believe Azure can handle overlapping IP ranges automatically, similar to how it handles route propagation, or they assume peering will work and Azure will prioritize routes.
✗Attach a route table to VNet-B so traffic to VNet-A is forced through a firewall appliance.Wrong answer — click to see why▾
Why this is wrong here
Route tables cannot resolve address space overlap; Azure VNet peering requires non-overlapping address spaces, and forcing traffic through a firewall does not change the underlying conflict.
★ When this WOULD be the correct answer
If the question involved controlling traffic flow between peered VNets (e.g., to inspect or filter traffic), attaching a route table with a firewall appliance would be correct to enforce routing policies.
Why candidates choose this
Candidates may think that a firewall can 'hide' the overlap by redirecting traffic, but Azure's peering validation checks address spaces at the VNet level, not at the route level.
✗Create a private endpoint between the two VNets so Azure ignores the overlap during connectivity checks.Wrong answer — click to see why▾
Why this is wrong here
Private endpoints are used for secure access to PaaS services over a private IP, not for resolving VNet peering address overlap. They do not bypass the requirement for non-overlapping address spaces in peering.
★ When this WOULD be the correct answer
When you need to connect to an Azure PaaS service (e.g., Storage, SQL Database) from a VNet without exposing it to the public internet, and you want the traffic to stay within the Microsoft backbone.
Why candidates choose this
Candidates may confuse private endpoints with a way to 'ignore' overlapping address spaces, thinking they provide a direct private connection that bypasses peering restrictions.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume Azure can handle overlapping address spaces through routing tricks (like route tables or firewalls), but Azure VNet peering strictly prohibits any address overlap and will reject the peering request outright, forcing you to resolve the conflict by adding a non-overlapping address space and migrating workloads.
Detailed technical explanation
How to think about this question
Azure VNet peering uses a flat routing model where each VNet's system routes are exchanged; overlapping address spaces cause routing conflicts because traffic destined to an overlapping prefix could be routed to either VNet, breaking connectivity. The address space validation occurs at the time of peering creation, and Azure does not support overlapping address spaces even with advanced routing configurations like forced tunneling or network virtual appliances. In real-world scenarios, you might use VNet-to-VNet VPN with NAT to handle overlaps, but that is not a peering solution and requires additional configuration.
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.
Visual reference
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: Add a new non-overlapping address space to VNet-B, create replacement subnets there, and migrate workloads gradually. — Azure Virtual Network peering requires that the address spaces of the peered VNets do not overlap. VNet-A uses 10.20.0.0/16, which fully contains VNet-B's 10.20.128.0/17, creating an overlap. Since VNet-B cannot be rebuilt, the correct first step is to add a new non-overlapping address space (e.g., 10.30.0.0/16) to VNet-B, create subnets in that new range, migrate workloads gradually, and then remove the overlapping address space before establishing the peering. This ensures no IP conflicts and avoids disrupting existing workloads.
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.
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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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