- A
Create an inbound allow rule for the web ASG to the app ASG on TCP 8080 with priority 150.
NSG rules are processed in priority order, where the lowest number wins. To permit only web-tier traffic to the app tier while preserving the deny rule, the allow rule must have a higher precedence than the DenyAllInbound entry. Using application security groups keeps the rule maintainable as VMs scale in or out, and the specific source, destination, and port limit access to exactly the required flow.
- B
Move the DenyAllInbound rule to priority 300 so all traffic is blocked first.
Why wrong: A lower-priority deny rule would not block traffic before the allow rule and would not create the required exception.
- C
Add a user-defined route from the web subnet to the app subnet.
Why wrong: Routing controls path selection, but it does not grant or deny access to TCP 8080.
- D
Associate the web and app NICs with the same application security group.
Why wrong: Putting both tiers in one ASG removes the source and destination separation needed for least privilege.
Override NSG Deny with Allow Using ASGs
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.
A three-tier application uses separate web and app VMs. The requirement is to allow only the web tier to reach the app tier on TCP 8080. The app subnet NSG already contains a DenyAllInbound rule at priority 200. What should the administrator do?
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
Create an inbound allow rule for the web ASG to the app ASG on TCP 8080 with priority 150.
Option A is correct because the existing DenyAllInbound rule at priority 200 will block all traffic to the app subnet unless a higher-priority (lower number) allow rule is created. By creating an inbound allow rule for the web Application Security Group (ASG) to the app ASG on TCP 8080 with priority 150, the administrator ensures that traffic from the web tier is explicitly permitted before the deny rule is evaluated, satisfying the requirement.
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.
- ✓
Create an inbound allow rule for the web ASG to the app ASG on TCP 8080 with priority 150.
Why this is correct
NSG rules are processed in priority order, where the lowest number wins. To permit only web-tier traffic to the app tier while preserving the deny rule, the allow rule must have a higher precedence than the DenyAllInbound entry. Using application security groups keeps the rule maintainable as VMs scale in or out, and the specific source, destination, and port limit access to exactly the required flow.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Move the DenyAllInbound rule to priority 300 so all traffic is blocked first.
Why it's wrong here
A lower-priority deny rule would not block traffic before the allow rule and would not create the required exception.
When this WOULD be correct
This option would be correct if the requirement was to ensure that a specific deny rule is evaluated after other rules, for example, to allow logging of denied traffic before the final deny, or to reorder rules for troubleshooting without changing the effective access.
- ✗
Add a user-defined route from the web subnet to the app subnet.
Why it's wrong here
Routing controls path selection, but it does not grant or deny access to TCP 8080.
When this WOULD be correct
A UDR would be correct if the requirement was to force-tunnel traffic from the web subnet to the app subnet through a network virtual appliance (NVA) for inspection, or to override Azure's default routing to direct traffic to a specific next hop.
- ✗
Associate the web and app NICs with the same application security group.
Why it's wrong here
Putting both tiers in one ASG removes the source and destination separation needed for least privilege.
When this WOULD be correct
In a scenario where all VMs in the same tier need to communicate freely (e.g., all web servers need to allow all inbound traffic from each other), associating them with the same ASG and creating an allow rule for the ASG would be correct.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓Create an inbound allow rule for the web ASG to the app ASG on TCP 8080 with priority 150.Correct answer▾
Why this is correct
NSG rules are processed in priority order, where the lowest number wins. To permit only web-tier traffic to the app tier while preserving the deny rule, the allow rule must have a higher precedence than the DenyAllInbound entry. Using application security groups keeps the rule maintainable as VMs scale in or out, and the specific source, destination, and port limit access to exactly the required flow.
✗Move the DenyAllInbound rule to priority 300 so all traffic is blocked first.Wrong answer — click to see why▾
Why this is wrong here
Moving the DenyAllInbound rule to a higher priority (300) would not change its effect; it still denies all traffic that is not explicitly allowed. The issue is that no allow rule exists for the web-to-app traffic, so lowering the priority does not create an allow rule.
★ When this WOULD be the correct answer
This option would be correct if the requirement was to ensure that a specific deny rule is evaluated after other rules, for example, to allow logging of denied traffic before the final deny, or to reorder rules for troubleshooting without changing the effective access.
Why candidates choose this
Candidates may think that adjusting priority alone can fix the problem, misunderstanding that NSG rules are evaluated in priority order and that a deny rule at any priority still blocks traffic unless a higher-priority allow rule exists.
✗Add a user-defined route from the web subnet to the app subnet.Wrong answer — click to see why▾
Why this is wrong here
User-defined routes (UDRs) control traffic routing between subnets, not access control. The requirement is to allow or deny traffic based on port and protocol, which is the function of NSG rules, not UDRs.
★ When this WOULD be the correct answer
A UDR would be correct if the requirement was to force-tunnel traffic from the web subnet to the app subnet through a network virtual appliance (NVA) for inspection, or to override Azure's default routing to direct traffic to a specific next hop.
Why candidates choose this
Candidates may confuse routing (UDRs) with access control (NSGs), thinking that directing traffic via a route implicitly allows it, or they may overcomplicate the solution by introducing routing when a simple NSG rule suffices.
✗Associate the web and app NICs with the same application security group.Wrong answer — click to see why▾
Why this is wrong here
Associating web and app NICs with the same ASG would allow all traffic between them, not restrict to TCP 8080 only, and would bypass the DenyAllInbound rule, violating the requirement.
★ When this WOULD be the correct answer
In a scenario where all VMs in the same tier need to communicate freely (e.g., all web servers need to allow all inbound traffic from each other), associating them with the same ASG and creating an allow rule for the ASG would be correct.
Why candidates choose this
Candidates may think that using the same ASG simplifies security by grouping resources, but they overlook that ASGs are used for source/destination filtering, not to automatically allow all traffic between members.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think moving the deny rule to a higher priority number (lower priority) will fix the issue, but without an explicit allow rule, traffic remains blocked; or they may confuse user-defined routes (which control routing) with NSG rules (which control filtering).
Detailed technical explanation
How to think about this question
NSG rules are evaluated in priority order (lowest number first) until a match is found; once a rule matches, no further rules are processed. The DenyAllInbound rule at priority 200 will match all inbound traffic to the app subnet unless a higher-priority allow rule (e.g., priority 150) explicitly permits it. Application Security Groups (ASGs) simplify rule creation by allowing you to reference groups of VMs by name rather than individual IP addresses, making the rule dynamic as VMs are added or removed.
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.
Visual reference
What to study next
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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: Create an inbound allow rule for the web ASG to the app ASG on TCP 8080 with priority 150. — Option A is correct because the existing DenyAllInbound rule at priority 200 will block all traffic to the app subnet unless a higher-priority (lower number) allow rule is created. By creating an inbound allow rule for the web Application Security Group (ASG) to the app ASG on TCP 8080 with priority 150, the administrator ensures that traffic from the web tier is explicitly permitted before the deny rule is evaluated, satisfying the requirement.
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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