AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
/26
The subnet prefix /26 provides 64 IP addresses per subnet (2^(32-26) = 64), of which 59 are usable after Azure reserves 5 addresses (first 4 and last 1). The planned resources require 50 IP addresses, so /26 is the smallest prefix that meets this requirement without waste. A /27 would only provide 32 total addresses (27 usable), which is insufficient.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
/27
Why it's wrong here
A /27 provides only 32 addresses, and Azure reserves five of them.
✓
/26
Why this is correct
A /26 provides 64 addresses, which is enough after Azure reserves five addresses.
Related concept
Read the scenario before looking for a memorised answer.
✗
/25
Why it's wrong here
A /25 works, but it is larger than necessary for the stated requirement.
✗
/24
Why it's wrong here
A /24 is much larger than needed and wastes address space unnecessarily.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often forget Azure reserves 5 IP addresses per subnet (not just 3 like on-premises) and incorrectly calculate usable addresses, leading them to choose /27 thinking 32 addresses are enough when only 27 are usable.
Detailed technical explanation
How to think about this question
Azure reserves the first four IP addresses (network address, default gateway, DNS, and Azure reserved) and the last broadcast address in each subnet, reducing usable addresses by 5. The formula for usable addresses is 2^(32 - prefix_length) - 5. For /26, this is 64 - 5 = 59 usable addresses, comfortably above 50. In real-world scenarios, always account for Azure's reserved addresses when sizing subnets to avoid IP exhaustion during scaling.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
Implement and Manage Virtual Networking — This question tests Implement and Manage Virtual Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: /26 — The subnet prefix /26 provides 64 IP addresses per subnet (2^(32-26) = 64), of which 59 are usable after Azure reserves 5 addresses (first 4 and last 1). The planned resources require 50 IP addresses, so /26 is the smallest prefix that meets this requirement without waste. A /27 would only provide 32 total addresses (27 usable), which is insufficient.
What should I do if I get this AZ-104 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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