- A
Move the allow rule for ASG-Web to ASG-App to a priority lower than 100.
NSG rules are processed in priority order, and the first matching rule wins. The deny rule at priority 100 matches traffic from the web tier because it comes from the same virtual network. Moving the specific allow rule to a lower number than 100 lets it match first while still keeping the source and destination restricted to the intended application security groups.
- B
Replace ASG-Web with the VirtualNetwork service tag in the allow rule.
Why wrong: Using VirtualNetwork would broaden the rule to more sources, not narrow it. It would also still lose to the deny rule at priority 100 unless the rule order changes.
- C
Add a route table that sends TCP 8443 traffic to the app subnet.
Why wrong: A route table controls next hop selection, not NSG filtering. Routing changes cannot override an inbound deny rule, so the connection would still be blocked.
- D
Create a second NSG on the app NIC with an allow rule at priority 50.
Why wrong: A NIC-level allow rule cannot override a subnet-level deny that already matched traffic first. The effective decision is still deny when the subnet rule with the lower priority number applies.
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 subnet NSG contains these inbound rules: Priority 100 denies TCP 8443 from VirtualNetwork to any destination, Priority 110 allows TCP 8443 from AzureLoadBalancer to any destination, and Priority 200 allows TCP 8443 from ASG-Web to ASG-App. The app VM NIC has no additional inbound rules. Web servers are members of ASG-Web and the app VM is a member of ASG-App. The web tier still cannot connect to TCP 8443. What should the administrator change?
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
Move the allow rule for ASG-Web to ASG-App to a priority lower than 100.
The correct answer is A because NSG rules are evaluated in priority order, from lowest to highest number. The deny rule at priority 100 explicitly blocks TCP 8443 from VirtualNetwork, which includes traffic from ASG-Web (since ASG-Web members are within the virtual network). The allow rule at priority 110 only permits traffic from AzureLoadBalancer, not from ASG-Web. The allow rule at priority 200 is never evaluated because the deny rule at priority 100 matches first. By moving the allow rule for ASG-Web to ASG-App to a priority lower than 100 (e.g., 90), it will be evaluated before the deny rule, allowing the web servers to connect.
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.
- ✓
Move the allow rule for ASG-Web to ASG-App to a priority lower than 100.
Why this is correct
NSG rules are processed in priority order, and the first matching rule wins. The deny rule at priority 100 matches traffic from the web tier because it comes from the same virtual network. Moving the specific allow rule to a lower number than 100 lets it match first while still keeping the source and destination restricted to the intended application security groups.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Replace ASG-Web with the VirtualNetwork service tag in the allow rule.
Why it's wrong here
Using VirtualNetwork would broaden the rule to more sources, not narrow it. It would also still lose to the deny rule at priority 100 unless the rule order changes.
- ✗
Add a route table that sends TCP 8443 traffic to the app subnet.
Why it's wrong here
A route table controls next hop selection, not NSG filtering. Routing changes cannot override an inbound deny rule, so the connection would still be blocked.
- ✗
Create a second NSG on the app NIC with an allow rule at priority 50.
Why it's wrong here
A NIC-level allow rule cannot override a subnet-level deny that already matched traffic first. The effective decision is still deny when the subnet rule with the lower priority number applies.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a more specific rule (like ASG-Web to ASG-App) will override a broader deny rule, but NSG priority is strictly numeric, not based on specificity, so a lower-priority allow rule is never evaluated if a higher-priority deny rule matches first.
Detailed technical explanation
How to think about this question
NSG rules are processed in ascending priority order, and once a rule matches, no further rules are evaluated for that packet. The VirtualNetwork service tag encompasses all virtual network IP ranges, including ASG members, so a deny rule with that tag blocks traffic from any VM in the virtual network. Application security groups (ASGs) allow grouping of VMs by application role, but they do not override priority-based rule evaluation; the rule with the lowest priority number wins regardless of specificity.
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: Move the allow rule for ASG-Web to ASG-App to a priority lower than 100. — The correct answer is A because NSG rules are evaluated in priority order, from lowest to highest number. The deny rule at priority 100 explicitly blocks TCP 8443 from VirtualNetwork, which includes traffic from ASG-Web (since ASG-Web members are within the virtual network). The allow rule at priority 110 only permits traffic from AzureLoadBalancer, not from ASG-Web. The allow rule at priority 200 is never evaluated because the deny rule at priority 100 matches first. By moving the allow rule for ASG-Web to ASG-App to a priority lower than 100 (e.g., 90), it will be evaluated before the deny rule, allowing the web servers to connect.
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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