Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company created a new spoke virtual network with the address space 10.40.1.0/24. The existing hub virtual network already uses 10.40.0.0/16. The administrator must peer the two VNets so resources can communicate normally. What must be changed before peering can succeed?
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 route table on the spoke subnet before adding the peering.
A route table does not resolve overlapping address spaces, so peering would still fail.
B
Best answer
Change the spoke VNet address space to a range that does not overlap the hub.
Azure virtual network peering requires non-overlapping IP address spaces on both sides. Because the spoke is using 10.40.1.0/24, which sits inside the hub's 10.40.0.0/16 range, peering cannot be created successfully. The administrator must renumber the spoke to a unique range before attempting the peering, then update any dependent subnet and DNS settings as needed.
C
Distractor review
Enable gateway transit on the hub peering to permit overlapping spaces.
Gateway transit helps share a gateway, but it does not allow overlapping IP ranges between VNets.
D
Distractor review
Add an NSG rule that allows traffic between the hub and spoke address spaces.
Network security groups filter traffic, but they do not make overlapping CIDR ranges valid for peering.
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 to a range that does not overlap the hub. — Azure virtual network peering requires each VNet to have a unique, non-overlapping address space. In this case, 10.40.1.0/24 is already contained within the hub's 10.40.0.0/16, so Azure will reject or block the peering design. The correct remediation is to renumber the spoke VNet into a different range that does not intersect with the hub, then recheck subnet assignments and any DNS or routing dependencies. Why others are wrong: Route tables and NSGs affect traffic flow after networks are connected, but they do not solve an address overlap. Gateway transit is only for sharing a VPN or ExpressRoute gateway and still requires unique IP ranges. The problem is the address design itself, so only renumbering the spoke fixes the peering prerequisite.
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.
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