- A
An inbound rule that uses the current web VM's private IP as the source and the current app VM's private IP as the destination.
Why wrong: IP-based rules work for one VM, but they do not scale cleanly when the tiers grow or change.
- B
An inbound rule with source WebASG, destination AppASG, protocol TCP, and destination port 8443.
Using application security groups is the best fit because the rule follows the role of the VM, not a fixed IP address. When new web or app VMs are added to their respective ASGs, the NSG rule automatically covers them. This provides least-privilege connectivity between tiers while keeping the configuration maintainable during scale-out and redeployment events.
- C
A route table that sends TCP 8443 traffic from the web subnet to the app subnet.
Why wrong: Route tables decide where traffic goes, but they do not allow or deny TCP ports between workloads.
- D
An Azure Firewall application rule collection that permits all traffic between the two subnets.
Why wrong: Azure Firewall could filter traffic, but this option is broader than requested and does not describe the most direct NSG-based tier control.
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
A web tier and an app tier run on separate Azure VMs in the same region. Each VM's NIC is added to an application security group named WebASG or AppASG. The administrator must allow only the web tier to connect to the app tier on TCP 8443, and future VM scale-outs must be included automatically. Which NSG rule should be created?
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
An inbound rule with source WebASG, destination AppASG, protocol TCP, and destination port 8443.
Option B is correct because application security groups (ASGs) allow you to configure network security as a natural extension of an application's structure, enabling you to group VMs by their roles (e.g., web tier, app tier) and define rules based on those groups. By creating an inbound NSG rule with source WebASG and destination AppASG on TCP port 8443, any VM added to WebASG can initiate traffic to any VM in AppASG, and future scale-outs are automatically included without manual IP updates. This approach is dynamic, scalable, and aligns with the requirement for automatic inclusion of new VMs.
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.
- ✗
An inbound rule that uses the current web VM's private IP as the source and the current app VM's private IP as the destination.
Why it's wrong here
IP-based rules work for one VM, but they do not scale cleanly when the tiers grow or change.
- ✓
An inbound rule with source WebASG, destination AppASG, protocol TCP, and destination port 8443.
Why this is correct
Using application security groups is the best fit because the rule follows the role of the VM, not a fixed IP address. When new web or app VMs are added to their respective ASGs, the NSG rule automatically covers them. This provides least-privilege connectivity between tiers while keeping the configuration maintainable during scale-out and redeployment events.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A route table that sends TCP 8443 traffic from the web subnet to the app subnet.
Why it's wrong here
Route tables decide where traffic goes, but they do not allow or deny TCP ports between workloads.
- ✗
An Azure Firewall application rule collection that permits all traffic between the two subnets.
Why it's wrong here
Azure Firewall could filter traffic, but this option is broader than requested and does not describe the most direct NSG-based tier control.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse network security groups (NSGs) with route tables, thinking that routing can enforce access control, or they default to using static IP addresses in NSG rules, missing the dynamic, group-based capability of application security groups that automatically includes new VMs.
Detailed technical explanation
How to think about this question
Application security groups (ASGs) are a feature of Azure Network Security Groups (NSGs) that allow you to reference logical groupings of VM NICs directly in security rules, using the 'ApplicationSecurityGroup' resource ID. Under the hood, the Azure fabric translates these ASG references into the actual IP addresses of the member VMs at the time of rule evaluation, ensuring that any newly added NIC to an ASG is immediately subject to the associated NSG rules without any manual intervention. This is particularly useful in auto-scaling scenarios where VMs are dynamically created and destroyed, as the NSG rules remain valid and effective without requiring updates to IP address lists.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: An inbound rule with source WebASG, destination AppASG, protocol TCP, and destination port 8443. — Option B is correct because application security groups (ASGs) allow you to configure network security as a natural extension of an application's structure, enabling you to group VMs by their roles (e.g., web tier, app tier) and define rules based on those groups. By creating an inbound NSG rule with source WebASG and destination AppASG on TCP port 8443, any VM added to WebASG can initiate traffic to any VM in AppASG, and future scale-outs are automatically included without manual IP updates. This approach is dynamic, scalable, and aligns with the requirement for automatic inclusion of new VMs.
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.
About these practice questions
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Last reviewed: Jun 11, 2026
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