Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
Your hub virtual network uses 10.40.0.0/16 and the corporate on-premises network uses 10.41.0.0/16. A new spoke VNet must be peered to the hub now and connected to on-premises later. It needs a workload subnet for about 180 hosts and a management subnet for about 50 hosts. Which address space is the best choice for the new spoke?
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
10.40.128.0/17
This overlaps the existing hub address space, which would block peering and future routing.
B
Distractor review
10.41.64.0/18
This falls inside the on-premises range and would create an address overlap later.
C
Best answer
10.42.0.0/23
This avoids overlap and provides enough space to split into one /24 and one smaller subnet cleanly.
D
Distractor review
10.42.0.0/24
A /24 is too small to comfortably host both subnet requirements within the same address space.
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: 10.42.0.0/23 — The new spoke must not overlap with either the hub or on-premises ranges, and it must provide enough room for a subnet of around 180 hosts and another of around 50 hosts. A /23 gives 512 total addresses, which is sufficient to carve out a /24 for the workload subnet and a /26 or similar subnet for management. It also stays outside the existing 10.40.0.0/16 and 10.41.0.0/16 spaces. Why others are wrong: 10.40.128.0/17 overlaps the hub. 10.41.64.0/18 overlaps the on-premises network. 10.42.0.0/24 is non-overlapping, but it is too small for both required subnets once you account for usable-host needs and Azure reservations. The correct answer must satisfy both uniqueness and capacity, which makes 10.42.0.0/23 the best choice.
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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