Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company is creating a new spoke virtual network that will be peered to an existing hub VNet. The hub uses 10.40.0.0/16, and an on-premises network already uses 10.41.0.0/16. The spoke must support about 120 endpoints now and should allow room for growth. Which address space should you assign to the new spoke VNet?
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
10.40.64.0/25
This range is too small for 120 endpoints plus future growth, and it is carved from the hub's existing address space.
B
Best answer
10.42.0.0/24
This is a non-overlapping private range that is large enough for the current requirement and leaves room for adding more subnets later.
C
Distractor review
10.41.128.0/24
This would conflict with the on-premises network range and would create routing problems during connectivity setup.
D
Distractor review
192.168.10.0/26
This is a valid private range, but it is too small for the stated endpoint count and expected growth.
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: 10.42.0.0/24 — The spoke VNet must not overlap with either the hub VNet or the on-premises network, and it needs enough IP capacity for 120 endpoints with growth. A /24 provides 256 addresses, which is a practical starting point for a spoke and leaves room for future subnet expansion. Choosing a separate private range also avoids peering and hybrid connectivity conflicts that can be difficult to troubleshoot later. Why others are wrong: A overlaps the hub address space and is far too small. C overlaps the on-premises network, which would break routing and peering design. D is non-overlapping, but /26 offers only 64 addresses and is not suitable for the stated scale.
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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