- A
NSG applied to subnet: Traffic filtering is applied to all network interfaces in that subnet.
An NSG associated with a subnet applies its rules to all VMs and resources within that subnet.
- B
ASG applied to VMs: Allows grouping of VMs for application of NSG rules based on workload roles.
ASGs enable logical grouping of VMs with similar functions, simplifying NSG rule creation.
- C
Service tag in NSG: Allows traffic only to specific IP ranges defined by user.
Why wrong: Service tags represent predefined IP ranges for Azure services; users cannot define custom IPs.
- D
ASG automatically updates NSG rules: ASGs integrate with NSGs but do not auto-update rules; rules must reference the ASG.
Why wrong: ASGs are referenced in NSG rules but do not automatically modify or update rules.
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.
Match each NSG or ASG scenario to the most accurate Azure security behavior.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
NSG applied to subnet: Traffic filtering is applied to all network interfaces in that subnet.
NSGs filter traffic at subnet or NIC level, while ASGs group VMs for scalable rule application. Service tags simplify rules for Azure services.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
NSG applied to subnet: Traffic filtering is applied to all network interfaces in that subnet.
Why this is correct
An NSG associated with a subnet applies its rules to all VMs and resources within that subnet.
Related concept
CIDR notation defines the prefix length.
- ✓
ASG applied to VMs: Allows grouping of VMs for application of NSG rules based on workload roles.
Why this is correct
ASGs enable logical grouping of VMs with similar functions, simplifying NSG rule creation.
Related concept
CIDR notation defines the prefix length.
- ✗
Service tag in NSG: Allows traffic only to specific IP ranges defined by user.
Why it's wrong here
Service tags represent predefined IP ranges for Azure services; users cannot define custom IPs.
- ✗
ASG automatically updates NSG rules: ASGs integrate with NSGs but do not auto-update rules; rules must reference the ASG.
Why it's wrong here
ASGs are referenced in NSG rules but do not automatically modify or update rules.
Common exam traps
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.
Detailed technical explanation
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.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-104 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this AZ-104 question test?
Implement and Manage Virtual Networking — This question tests Implement and Manage Virtual Networking — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: NSG applied to subnet: Traffic filtering is applied to all network interfaces in that subnet. — NSGs filter traffic at subnet or NIC level, while ASGs group VMs for scalable rule application. Service tags simplify rules for Azure services.
What should I do if I get this AZ-104 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-104 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
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Last reviewed: May 17, 2026
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