Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A team is creating a subnet for 48 small Linux VMs, two internal load balancer frontend IPs, and one Azure Bastion host. Azure reserves five IP addresses in every subnet. Which subnet prefix is the smallest that will still meet the requirement?
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 27 usable IP addresses after Azure reservations, which is not enough for all required resources.
B
Best answer
/26
A /26 provides 64 total addresses, and Azure reserves five, leaving 59 usable addresses. That is enough for 48 VMs, two load balancer frontend IPs, and one Bastion host.
C
Distractor review
/25
A /25 would work, but it is larger than necessary and wastes address space that could be used elsewhere.
D
Distractor review
/28
A /28 is far too small for this design and cannot support the number of required private IP addresses.
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.
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Question 2
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Question 3
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Question 4
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Question 5
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Question 6
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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 — A /26 is the smallest subnet that satisfies the requirement. Azure reserves five IPs per subnet, so a /26 leaves 59 usable addresses. The workload needs 51 addresses total: 48 VM NICs, 2 load balancer frontend IPs, and 1 Bastion host. Choosing the smallest sufficient subnet helps conserve address space for future subnets and avoids unnecessary over-allocation. Why others are wrong: /27 and /28 do not provide enough usable addresses after Azure's reserved IPs are removed. /25 would technically satisfy the design, but it is larger than necessary, so it is not the best answer when the question asks for the smallest prefix that still works.
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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