Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company plans a new spoke virtual network that must be peered to an existing hub VNet using 10.0.0.0/16. The spoke will need two subnets: one sized for about 120 VMs and another for about 40 VMs. The new address space must not overlap the hub or the on-premises range 10.1.0.0/16. Which VNet address space is the best choice?
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
10.0.1.0/24
This overlaps the hub VNet address space and cannot be used for peering.
B
Distractor review
10.1.0.0/22
This overlaps the on-premises address range and would create routing conflicts.
C
Best answer
10.2.0.0/22
This address space does not overlap the hub or on-premises ranges and is large enough to carve out two usable subnets for the workload. A /22 gives room for multiple subnets and future growth, which is important when planning a spoke that needs to host dozens or hundreds of VMs. It is a practical choice for peering compatibility and capacity.
D
Distractor review
10.0.0.0/24
This is entirely inside the hub address space and would not be valid for the new spoke.
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: 10.2.0.0/22 — The spoke must use a non-overlapping private address space to peer successfully with the hub and avoid conflicts with the on-premises network. 10.2.0.0/22 satisfies that requirement and provides enough capacity to create two subnets for approximately 120 and 40 VMs with some room for growth. Choosing a larger, non-overlapping block is the safest and most flexible design. Why others are wrong: Any prefix inside 10.0.0.0/16 overlaps the hub, and 10.1.0.0/16 overlaps on-premises. Overlapping ranges break routing and peering assumptions. The correct answer must be both unique in the environment and large enough to support the planned subnetting, which is why 10.2.0.0/22 is the only viable option here.
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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