- A
Add a new non-overlapping address space to VNet-B.
This gives VNet-B a range that does not conflict with VNet-A, which is required for peering.
- B
Migrate the workloads and subnets in VNet-B to the new address space before removing the overlapping range.
This preserves application connectivity while the overlapping CIDR is phased out and the peering can be created.
- C
Enable gateway transit on both VNets to bypass the overlap check.
Why wrong: Gateway transit changes routing behavior, but it does not remove the address-space overlap restriction for peering.
- D
Create a private endpoint in VNet-A so the peering can use private connectivity.
Why wrong: Private endpoints are for PaaS service access, not for resolving overlapping CIDR blocks between VNets.
- E
Associate a route table with VNet-B to force Azure to accept the peering.
Why wrong: Route tables influence packet forwarding, but they do not change VNet peering validation requirements.
Quick Answer
The correct answer is to migrate the workloads and subnets in VNet-B to a new address space before removing the overlapping range. This resolves the VNet peering failure due to overlapping address spaces because Azure requires that peered VNets have no IP address range conflicts; when both VNet-A and VNet-B contain 10.40.0.0/16, the peering attempt is blocked at the network layer. By first adding a non-overlapping range like 10.41.0.0/16 to VNet-B, you create a valid peering foundation while the existing overlapping range still hosts active workloads—this allows a zero-downtime migration. On the AZ-104 exam, this scenario tests your understanding that VNet peering is address-space-sensitive and that you must add before you remove to avoid service interruption. A common trap is trying to delete the overlapping range first, which would orphan running resources. Memory tip: “Add space, then migrate, then erase the duplicate—never leave workloads in an overlapping place.”
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 VNet peering attempt between VNet-A and VNet-B fails because both VNets include 10.40.0.0/16. VNet-B hosts active workloads, so the team wants to readdress it without downtime. Which two actions should the administrator take? Select two.
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.
Option A is correct because adding a new non-overlapping address space to VNet-B resolves the IP address overlap that prevents VNet peering. Azure VNet peering requires that the address spaces of both VNets do not overlap; overlapping ranges cause the peering to fail. By adding a new range (e.g., 10.41.0.0/16) to VNet-B, the administrator introduces a non-conflicting address space that can be used for peering while the existing overlapping range remains active for 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.
- ✓
Add a new non-overlapping address space to VNet-B.
Why this is correct
This gives VNet-B a range that does not conflict with VNet-A, which is required for peering.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Migrate the workloads and subnets in VNet-B to the new address space before removing the overlapping range.
Why this is correct
This preserves application connectivity while the overlapping CIDR is phased out and the peering can be created.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable gateway transit on both VNets to bypass the overlap check.
Why it's wrong here
Gateway transit changes routing behavior, but it does not remove the address-space overlap restriction for peering.
- ✗
Create a private endpoint in VNet-A so the peering can use private connectivity.
- ✗
Associate a route table with VNet-B to force Azure to accept the peering.
Why it's wrong here
Route tables influence packet forwarding, but they do not change VNet peering validation requirements.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think gateway transit or route tables can override the address space overlap requirement, but Azure strictly enforces non-overlapping address spaces for VNet peering, and only address space modification resolves the conflict.
Detailed technical explanation
How to think about this question
Azure VNet peering uses the Azure backbone to connect VNets, and the address space validation is performed at the Azure Resource Manager layer. When overlapping ranges exist, Azure cannot route traffic correctly because it cannot distinguish which VNet owns a given IP address. The recommended approach is to add a new address space, migrate subnets and workloads to it (using techniques like adding new subnets, moving resources, or using Azure Site Recovery), and then remove the overlapping range—all without downtime if done incrementally.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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. — Option A is correct because adding a new non-overlapping address space to VNet-B resolves the IP address overlap that prevents VNet peering. Azure VNet peering requires that the address spaces of both VNets do not overlap; overlapping ranges cause the peering to fail. By adding a new range (e.g., 10.41.0.0/16) to VNet-B, the administrator introduces a non-conflicting address space that can be used for peering while the existing overlapping range remains active for 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.
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 →
Same concept, more angles
1 more ways this is tested on AZ-104
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company wants to peer two Azure virtual networks so that workloads can communicate privately. VNet-A uses 10.10.0.0/16. VNet-B is being designed now. Which address space should be chosen for VNet-B?
easy- A.10.10.5.0/24, because it is a smaller subnet inside the same private range.
- ✓ B.10.11.0.0/16, because it does not overlap and is still within a private IPv4 range.
- C.10.10.0.0/24, because peering automatically separates overlapping subnets.
- D.192.168.1.0/24, because peered networks must always use the 192.168.x.x range.
Why B: Option B is correct because VNet peering requires non-overlapping address spaces to enable direct private IP connectivity between resources. 10.11.0.0/16 is a unique private IPv4 range (RFC 1918) that does not overlap with VNet-A's 10.10.0.0/16, ensuring successful peering without routing conflicts.
Last reviewed: Jun 11, 2026
This AZ-104 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-104 exam.
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