Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Exhibit
Subnet design notes: 28 VM NICs; 4 private endpoints; 2 internal load balancer frontend IP configurations; 5 additional IPs reserved for short-term growth.
Based on the exhibit, which subnet prefix is the smallest that can support the planned resources in Azure?
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
/27
A /27 provides only 32 addresses, and Azure reserves five of them.
B
Best answer
/26
A /26 provides 64 addresses, which is enough after Azure reserves five addresses.
C
Distractor review
/25
A /25 works, but it is larger than necessary for the stated requirement.
D
Distractor review
/24
A /24 is much larger than needed and wastes address space unnecessarily.
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: /26 — The subnet must accommodate 28 VM NICs, 4 private endpoints, 2 load balancer frontend IPs, and 5 future IPs, for 39 usable addresses before Azure reservations. Azure reserves 5 addresses in every subnet, so a /26 is the smallest prefix that still leaves enough usable IPs. A /27 would not provide enough usable addresses, while larger prefixes would meet the need but are not the smallest valid choice. Why others are wrong: A /27 is too small once Azure’s reserved addresses are accounted for. /25 and /24 would both work, but they are not the minimum size required, so they are inefficient for this design. The question asks for the smallest prefix that satisfies the requirement, which makes /26 the only correct answer.
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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