- A
Change the allow rule source from an Application Security Group to VirtualNetwork.
Why wrong: The source is not the main issue here; the lower-priority deny rule is evaluated first and blocks the traffic.
- B
Move the allow rule to a lower priority number than the deny rule.
NSG rules are processed by priority, and the lowest number wins. Because the deny rule at priority 100 is evaluated before the allow rule at 200, the traffic is blocked. The administrator should make the allow rule a smaller number than the deny rule or remove the conflicting deny rule.
- C
Attach a user-defined route to the subnet so traffic bypasses the NSG.
Why wrong: User-defined routes affect path selection, but they do not override NSG decisions or bypass inbound filtering.
- D
Place the backend VM in a different availability set so the rule is evaluated differently.
Why wrong: Availability sets improve resiliency, but they do not change NSG processing or traffic filtering behavior.
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.
A subnet has an NSG with these inbound rules: priority 100 denies TCP 443 from Any, and priority 200 allows TCP 443 from an Application Security Group named WebFrontEnd. A backend VM in the subnet still does not accept traffic from the frontend tier. 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 to a lower priority number than the deny rule.
Network Security Group (NSG) rules are evaluated in priority order, with lower numbers evaluated first. Since the deny rule has priority 100 and the allow rule has priority 200, the deny rule is evaluated first and blocks TCP 443 traffic from any source, including the WebFrontEnd Application Security Group. To allow the frontend traffic, the allow rule must be moved to a lower priority number (e.g., 90) so it is evaluated before the deny rule.
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.
- ✗
Change the allow rule source from an Application Security Group to VirtualNetwork.
Why it's wrong here
The source is not the main issue here; the lower-priority deny rule is evaluated first and blocks the traffic.
When this WOULD be correct
If the question stated that the allow rule had a lower priority (higher number) than the deny rule, but traffic from the frontend tier was still not reaching the backend VM because the frontend VMs were not in the same virtual network as the backend subnet, then changing the source from an Application Security Group to VirtualNetwork would allow traffic from any VM in the virtual network.
- ✓
Move the allow rule to a lower priority number than the deny rule.
Why this is correct
NSG rules are processed by priority, and the lowest number wins. Because the deny rule at priority 100 is evaluated before the allow rule at 200, the traffic is blocked. The administrator should make the allow rule a smaller number than the deny rule or remove the conflicting deny rule.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Attach a user-defined route to the subnet so traffic bypasses the NSG.
Why it's wrong here
User-defined routes affect path selection, but they do not override NSG decisions or bypass inbound filtering.
When this WOULD be correct
An administrator needs to force traffic from a subnet to go through a network virtual appliance (NVA) for inspection. In that scenario, a UDR is attached to the subnet to override the default system route and direct traffic to the NVA, ensuring traffic bypasses direct routing.
- ✗
Place the backend VM in a different availability set so the rule is evaluated differently.
Why it's wrong here
Availability sets improve resiliency, but they do not change NSG processing or traffic filtering behavior.
When this WOULD be correct
In a scenario where a VM in an availability set is not receiving traffic due to a load balancer health probe failing because VMs in the same availability set are all down, moving the VM to a different availability set could restore connectivity by ensuring at least one healthy VM responds.
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.
✓Move the allow rule to a lower priority number than the deny rule.Correct answer▾
Why this is correct
NSG rules are processed by priority, and the lowest number wins. Because the deny rule at priority 100 is evaluated before the allow rule at 200, the traffic is blocked. The administrator should make the allow rule a smaller number than the deny rule or remove the conflicting deny rule.
✗Change the allow rule source from an Application Security Group to VirtualNetwork.Wrong answer — click to see why▾
Why this is wrong here
The NSG rules are evaluated by priority order; the deny rule at priority 100 blocks all TCP 443 traffic before the allow rule at priority 200 is evaluated. Changing the source to VirtualNetwork does not resolve the priority issue.
★ When this WOULD be the correct answer
If the question stated that the allow rule had a lower priority (higher number) than the deny rule, but traffic from the frontend tier was still not reaching the backend VM because the frontend VMs were not in the same virtual network as the backend subnet, then changing the source from an Application Security Group to VirtualNetwork would allow traffic from any VM in the virtual network.
Why candidates choose this
Candidates may think that using an Application Security Group is too restrictive and that allowing traffic from the entire virtual network is a broader and safer approach, overlooking that the core issue is rule priority.
✗Attach a user-defined route to the subnet so traffic bypasses the NSG.Wrong answer — click to see why▾
Why this is wrong here
NSGs filter traffic based on rules; a user-defined route (UDR) controls traffic routing, not NSG filtering. Attaching a UDR does not bypass NSG rules, so it would not resolve the issue where a higher-priority deny rule blocks traffic.
★ When this WOULD be the correct answer
An administrator needs to force traffic from a subnet to go through a network virtual appliance (NVA) for inspection. In that scenario, a UDR is attached to the subnet to override the default system route and direct traffic to the NVA, ensuring traffic bypasses direct routing.
Why candidates choose this
Candidates may confuse NSG filtering with routing, thinking that changing the route can bypass security rules. They might also believe that UDRs can override all network controls, not just routing decisions.
✗Place the backend VM in a different availability set so the rule is evaluated differently.Wrong answer — click to see why▾
Why this is wrong here
Availability sets affect VM high availability, not NSG rule evaluation. NSG rules are evaluated based on priority and source/destination, not the VM's availability set membership.
★ When this WOULD be the correct answer
In a scenario where a VM in an availability set is not receiving traffic due to a load balancer health probe failing because VMs in the same availability set are all down, moving the VM to a different availability set could restore connectivity by ensuring at least one healthy VM responds.
Why candidates choose this
Candidates may confuse availability sets with network isolation or think that changing the VM's placement alters how NSG rules are applied, due to a misunderstanding of Azure networking and high availability concepts.
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 often assume allow rules override deny rules or that more specific rules (like those using Application Security Groups) take precedence regardless of priority, but in Azure NSGs, priority order strictly determines which rule is applied first.
Detailed technical explanation
How to think about this question
NSG rules are processed in ascending order of priority (lower number = higher priority) until a match is found; once a rule matches, no further rules are evaluated. In this scenario, the deny rule at priority 100 matches all TCP 443 traffic, so the allow rule at priority 200 is never reached. This is a common misconfiguration where a broad deny rule inadvertently blocks traffic that should be allowed by a more specific rule at a higher priority number.
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: Move the allow rule to a lower priority number than the deny rule. — Network Security Group (NSG) rules are evaluated in priority order, with lower numbers evaluated first. Since the deny rule has priority 100 and the allow rule has priority 200, the deny rule is evaluated first and blocks TCP 443 traffic from any source, including the WebFrontEnd Application Security Group. To allow the frontend traffic, the allow rule must be moved to a lower priority number (e.g., 90) so it is evaluated before the deny rule.
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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