- A
A rule that allows TCP 8443 from the current Web subnet address range to the App subnet.
Why wrong: Using current subnet IP ranges can work temporarily, but it does not scale cleanly when instances are added or replaced. The requirement specifically calls for automatic membership.
- B
An inbound allow rule using source WebASG, destination AppASG, TCP 8443, with a priority lower than 300.
Application security groups let you target groups of VMs by workload rather than by static IPs. A rule that allows TCP 8443 from WebASG to AppASG will automatically include future scale-set instances as they join the ASGs. The rule must also have a lower priority number than the existing deny rule, otherwise the deny will win first.
- C
A load balancer NAT rule that maps port 8443 from the Internet to the App tier.
Why wrong: A load balancer NAT rule is for inbound translation to individual instances, not for defining east-west application-tier access inside the virtual network.
- D
A service endpoint for Microsoft.Web on both subnets.
Why wrong: Service endpoints are unrelated to internal VM-to-VM traffic and do not filter or permit traffic between application tiers.
Quick Answer
The correct answer is an inbound allow rule using source WebASG, destination AppASG, TCP 8443, with a priority lower than 300. This works because Application Security Groups (ASGs) allow you to group VM scale set instances logically, so any new scale-out instances are automatically included in the NSG rule without manual updates. By setting the rule priority lower than 300, it is evaluated before the existing Deny-All-Inbound rule, ensuring only the Web tier can reach the App tier on the specified port. On the AZ-104 exam, this scenario tests your understanding of how ASGs simplify network security for dynamic workloads like scale sets, and a common trap is to mistakenly add a rule with a higher priority than 300, which would be ignored. Remember the memory tip: “ASG for auto-include, lower priority to exclude the deny.”
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.
Two VM scale sets named Web and App run in separate subnets. The App subnet NSG already contains Deny-All-Inbound at priority 300. The business wants only the Web tier to connect to the App tier on TCP 8443, and any new scale-out instances must be included automatically. What should the administrator add?
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 allow rule using source WebASG, destination AppASG, TCP 8443, with a priority lower than 300.
Option B is correct because it uses an Application Security Group (ASG) as the source and destination, which automatically includes all current and future VM instances in the Web and App scale sets. The rule allows TCP 8443 from WebASG to AppASG with a priority lower than 300 (e.g., 250) so it is evaluated before the Deny-All-Inbound rule at priority 300. This ensures that only the Web tier can connect to the App tier on the specified port, and new scale-out instances are included automatically without manual NSG updates.
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.
- ✗
A rule that allows TCP 8443 from the current Web subnet address range to the App subnet.
Why it's wrong here
Using current subnet IP ranges can work temporarily, but it does not scale cleanly when instances are added or replaced. The requirement specifically calls for automatic membership.
- ✓
An inbound allow rule using source WebASG, destination AppASG, TCP 8443, with a priority lower than 300.
Why this is correct
Application security groups let you target groups of VMs by workload rather than by static IPs. A rule that allows TCP 8443 from WebASG to AppASG will automatically include future scale-set instances as they join the ASGs. The rule must also have a lower priority number than the existing deny rule, otherwise the deny will win first.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A load balancer NAT rule that maps port 8443 from the Internet to the App tier.
Why it's wrong here
A load balancer NAT rule is for inbound translation to individual instances, not for defining east-west application-tier access inside the virtual network.
- ✗
A service endpoint for Microsoft.Web on both subnets.
Why it's wrong here
Service endpoints are unrelated to internal VM-to-VM traffic and do not filter or permit traffic between application tiers.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose a static subnet-based rule (Option A) because it seems simpler, failing to recognize that ASGs are required to automatically include new scale-out instances without manual NSG updates.
Detailed technical explanation
How to think about this question
Application Security Groups (ASGs) allow you to group VM NICs logically and reference them in NSG rules, enabling dynamic membership that scales with VM scale set instances. When a new VM is added to the scale set, its NIC is automatically associated with the ASG, and the NSG rule applies immediately without any manual reconfiguration. This is particularly useful in microservices architectures where tiers must be isolated and only specific communication paths are allowed, as it reduces administrative overhead and prevents misconfiguration during scaling events.
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 allow rule using source WebASG, destination AppASG, TCP 8443, with a priority lower than 300. — Option B is correct because it uses an Application Security Group (ASG) as the source and destination, which automatically includes all current and future VM instances in the Web and App scale sets. The rule allows TCP 8443 from WebASG to AppASG with a priority lower than 300 (e.g., 250) so it is evaluated before the Deny-All-Inbound rule at priority 300. This ensures that only the Web tier can connect to the App tier on the specified port, and new scale-out instances are included automatically without manual NSG updates.
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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Last reviewed: Jun 11, 2026
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