Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A company has VNet-A with address space 10.20.0.0/16 and active workloads in several subnets. The team must peer VNet-A with VNet-B, but VNet-B currently uses 10.20.128.0/17 and cannot be rebuilt from scratch. What should the administrator do first to make peering possible without interrupting current workloads?
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 the peering now and let Azure automatically route overlapping prefixes.
Azure peering does not support overlapping address spaces, even if routing is otherwise correct.
B
Best answer
Add a new non-overlapping address space to VNet-B, create replacement subnets there, and migrate workloads gradually.
A second non-overlapping range lets you prepare new subnets and move workloads before removing the conflicting range.
C
Distractor review
Attach a route table to VNet-B so traffic to VNet-A is forced through a firewall appliance.
Route tables do not solve overlapping IP ranges or make peering between conflicting VNets possible.
D
Distractor review
Create a private endpoint between the two VNets so Azure ignores the overlap during connectivity checks.
Private endpoints are for PaaS resource access, not for enabling direct VNet-to-VNet 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: Add a new non-overlapping address space to VNet-B, create replacement subnets there, and migrate workloads gradually. — Azure VNet peering requires non-overlapping address spaces. When both VNets already contain overlapping prefixes, peering creation fails regardless of routes, gateways, or DNS settings. The practical way to preserve service availability is to introduce a new, non-overlapping address range on the VNet that must be changed, build new subnets in that range, and migrate workloads there before removing the old overlapping prefix and creating peering. Why others are wrong: Peering cannot be created with overlapping ranges, so Azure cannot “auto-fix” the conflict. A route table only affects path selection after networking is established; it does not bypass peering validation. Private endpoints are for exposing PaaS resources privately to a VNet, not for connecting two VNets directly. The core issue is address-space design, so readdressing is required.
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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