Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
Two application teams created separate virtual networks so their workloads can communicate through VNet peering. VNet-A uses 10.20.0.0/16. VNet-B was created with 10.20.128.0/17. The peering request fails during validation. What is the best fix?
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
Add an NSG rule to allow traffic between the two VNets.
NSGs control packet filtering, but they do not resolve overlapping address spaces during peering creation.
B
Best answer
Change one VNet to use a non-overlapping address space.
VNet peering requires non-overlapping IP ranges. Readdressing one VNet removes the conflict and allows peering to be created.
C
Distractor review
Create a private endpoint in each VNet.
Private endpoints help reach PaaS services privately, but they do not solve VNet-to-VNet address conflicts.
D
Distractor review
Attach a route table to both subnets.
Route tables affect traffic forwarding, but peering still fails if the address spaces overlap.
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 use a non-overlapping address space. — Azure VNet peering only works when the address spaces do not overlap. In this scenario, both virtual networks include 10.20.128.0/17, which is inside VNet-A's 10.20.0.0/16 range. The administrator must change one VNet's address space so the ranges are distinct. After that, peering can be created and routes will be exchanged normally. Why others are wrong: NSGs do not change the peering validation requirement. Private endpoints are for private access to supported Azure services, not for VNet peering. Route tables influence forwarding behavior after connectivity exists, but they cannot fix overlapping IP ranges that block peering creation.
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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