Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
Exhibit
HubVNet address space: 10.40.0.0/16 SpokeVNet address space: 10.40.1.0/24 Peering status: Failed Error: Virtual network address space overlaps with another peered network
Based on the exhibit, the administrator cannot create VNet peering between the hub and spoke networks. What should be changed?
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
Change the hub VNet to use a smaller subnet mask.
Peering problems caused by overlapping ranges are not fixed by simply resizing the hub network. The overlap must be removed between the two VNet address spaces first.
B
Best answer
Change the spoke VNet address space so it does not overlap the hub.
This is the correct fix because Azure VNet peering requires non-overlapping IP ranges. The exhibit shows the spoke range sits inside the hub range, which causes the peering attempt to fail. Readdressing the spoke to a unique CIDR block resolves the conflict and allows the peering to be created.
C
Distractor review
Add a route table to the spoke VNet before creating peering.
Route tables control traffic flow after connectivity exists, but they do not solve CIDR overlap during peering creation. The error in the exhibit is about address space conflict, not routing.
D
Distractor review
Enable a service endpoint on both VNets.
Service endpoints extend access to supported Azure services, but they do not affect VNet-to-VNet address space validation. They cannot make overlapping peering ranges acceptable.
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 the spoke VNet address space so it does not overlap the hub. — Azure VNet peering only works when the connected VNets have non-overlapping address spaces. In the exhibit, the spoke range 10.40.1.0/24 is contained within the hub range 10.40.0.0/16, so Azure rejects the peering request. The administrator should readdress the spoke to a different private CIDR block, then recreate the peering. This is a common design issue when VNets are planned independently. Why others are wrong: Resizing the hub, adding routes, or enabling service endpoints does not remove the overlapping CIDR conflict. Those settings affect traffic behavior or service access after connectivity exists, not the peering validation step. The problem is specifically that the IP spaces collide, so only readdressing one network solves it.
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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