- A
Allow TCP 8443 from WebASG to AppASG with a priority lower number than the deny rule.
This is the most precise approach because it targets the source and destination groups instead of broad IP ranges. The rule must use a lower priority number than the deny-all rule so it is evaluated first. That lets only the web tier reach the app tier on TCP 8443 while preserving the block on all other inbound traffic.
- B
Allow TCP 8443 from the entire virtual network to the app subnet with a lower priority than the deny rule.
Why wrong: This would permit more traffic than required because every subnet in the VNet could reach the app tier.
- C
Allow UDP 8443 from WebASG to AppASG with any priority below 65000.
Why wrong: The protocol is wrong because the application requires TCP, and NSG priority still must beat the deny rule.
- D
Allow TCP 8443 from WebASG to AppASG with a priority higher number than the deny rule.
Why wrong: A higher numeric priority is evaluated later, so the deny rule would take effect first and block the traffic.
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 web tier and an app tier run in separate subnets. Each VM NIC is placed in an application security group named WebASG or AppASG. The administrator must allow only the web tier to reach the app tier on TCP port 8443 and block all other inbound traffic to the app tier. Which NSG rule should be created on the app subnet?
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
Allow TCP 8443 from WebASG to AppASG with a priority lower number than the deny rule.
Option A is correct because NSG rules are evaluated in priority order, with lower numbers having higher priority. By placing an Allow rule for TCP 8443 from WebASG to AppASG with a lower priority number than a subsequent Deny-All rule, only traffic from the web tier is permitted, and all other inbound traffic to the app subnet is blocked. This leverages application security groups (ASGs) to define fine-grained, role-based network security policies without relying on IP addresses.
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.
- ✓
Allow TCP 8443 from WebASG to AppASG with a priority lower number than the deny rule.
Why this is correct
This is the most precise approach because it targets the source and destination groups instead of broad IP ranges. The rule must use a lower priority number than the deny-all rule so it is evaluated first. That lets only the web tier reach the app tier on TCP 8443 while preserving the block on all other inbound traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Allow TCP 8443 from the entire virtual network to the app subnet with a lower priority than the deny rule.
Why it's wrong here
This would permit more traffic than required because every subnet in the VNet could reach the app tier.
- ✗
Allow UDP 8443 from WebASG to AppASG with any priority below 65000.
Why it's wrong here
The protocol is wrong because the application requires TCP, and NSG priority still must beat the deny rule.
- ✗
Allow TCP 8443 from WebASG to AppASG with a priority higher number than the deny rule.
Why it's wrong here
A higher numeric priority is evaluated later, so the deny rule would take effect first and block the traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse priority numbering—thinking a higher number means higher priority—or mistakenly assume that allowing traffic from the entire virtual network is sufficient, overlooking the need to restrict the source to only the web tier via ASGs.
Detailed technical explanation
How to think about this question
Network Security Groups (NSGs) process rules in ascending order of priority (lower number = higher priority), and each rule is evaluated until a match is found; if no rule matches, traffic is denied by default. Application Security Groups (ASGs) allow grouping of VM NICs by application role (e.g., WebASG, AppASG) so that NSG rules can reference these logical groups instead of static IP addresses, simplifying management in dynamic environments. In a real-world scenario, this pattern is commonly used in multi-tier applications where the web tier must communicate with the app tier on a specific port while all other inbound traffic (e.g., from management or other subnets) is explicitly denied.
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: Allow TCP 8443 from WebASG to AppASG with a priority lower number than the deny rule. — Option A is correct because NSG rules are evaluated in priority order, with lower numbers having higher priority. By placing an Allow rule for TCP 8443 from WebASG to AppASG with a lower priority number than a subsequent Deny-All rule, only traffic from the web tier is permitted, and all other inbound traffic to the app subnet is blocked. This leverages application security groups (ASGs) to define fine-grained, role-based network security policies without relying on IP addresses.
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
This AZ-104 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-104 exam.
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