Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
Exhibit
VNet-DevA address space: 10.20.0.0/16 VNet-DevB address space: 10.20.128.0/17 Peering status: Not created Deployment note: The peering wizard returns an address space overlap error.
Based on the exhibit, two development virtual networks must be peered so the workloads can exchange traffic directly. What should the administrator do first?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Create a VPN gateway in each VNet before attempting peering.
A gateway is not required for standard VNet peering, so this would not resolve the overlap error.
B
Best answer
Change one VNet to a non-overlapping address space before creating the peering.
Azure VNet peering does not allow overlapping address spaces. The first step is to redesign one network so its address range does not intersect the other. After the address conflict is removed, peering can be created normally and traffic can flow directly between the VNets.
C
Distractor review
Add a user-defined route to each subnet so the VNets can ignore the overlap.
Routes control traffic selection after connectivity exists, but they do not remove peering validation failures caused by overlapping IP ranges.
D
Distractor review
Enable service endpoints on both VNets to allow cross-network communication.
Service endpoints are for Azure PaaS services, not for connecting one virtual network to another or fixing overlapping ranges.
Common exam trap
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Technical deep dive
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A route table contains these entries: 10.0.0.0/8 with next hop Virtual appliance, and 10.1.1.0/24 with next hop Virtual network gateway. Which next hop will Azure use for traffic to 10.1.1.5?
Question 2
You are deploying a stateless web application on Azure virtual machines. The solution must automatically add and remove instances based on CPU demand and allow all instances to be managed as one logical group. Which Azure compute feature should you deploy?
Question 3
You are deploying a Windows Server VM for an internal app. The VM must support Secure Boot and vTPM later, its OS disk must survive host moves, and the team wants the lowest-cost managed disk tier that still behaves like a normal writable OS disk. Which two choices should you make? Select two.
Question 4
You need to deploy several identical virtual machines and ensure that the failure of a single Azure host does not affect all of them. Which feature should you use?
Question 5
You need to connect VNet-Hub and VNet-Spoke so that resources in both virtual networks can communicate privately over the Microsoft backbone. Both virtual networks are in the same region. What should you configure?
Question 6
You need to create a storage account that provides the lowest-cost redundant storage for non-critical data and only needs protection against local disk or server failure within a single datacenter. Which redundancy option should you choose?
FAQ
Questions learners often ask
What does this AZ-104 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: Change one VNet to a non-overlapping address space before creating the peering. — Azure virtual network peering requires non-overlapping address spaces. The exhibit shows that VNet-DevA uses 10.20.0.0/16 and VNet-DevB uses 10.20.128.0/17, which sits inside the first range. Because Azure cannot route between overlapping prefixes through peering, the administrator must change one network to a different, non-overlapping CIDR block before creating the peering relationship. Why others are wrong: A gateway is unnecessary for direct VNet peering and does not solve address overlap. UDRs only influence route selection after connectivity exists, so they do not bypass peering validation. Service endpoints are unrelated to VNet-to-VNet communication and only extend subnet access to supported Azure services.
What should I do if I get this AZ-104 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
Discussion
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