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.
An NSG outbound rule allows TCP 8443 traffic from ASG-Web to ASG-Api. The web VM NIC is in ASG-Web, but the API VM NICs were deployed into the correct subnet and never added to ASG-Api. The traffic still fails. What should the administrator do?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "never"
Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add the API VM NICs to ASG-Api.
The NSG rule references ASG-Api as the destination, but the API VM NICs were never added to that application security group. ASGs are logical groupings of VM NICs; a rule targeting an ASG only applies to NICs that are members of that ASG. Since the API NICs are not in ASG-Api, the rule does not match them, and traffic fails. Adding the API VM NICs to ASG-Api resolves the issue by making them valid destinations for the 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.
✗
Move the NSG to the web subnet so source membership is automatically detected.
Why it's wrong here
NSG location does not change ASG membership; the destination VM still must belong to the destination ASG.
✓
Add the API VM NICs to ASG-Api.
Why this is correct
ASG-based NSG rules match the actual NIC memberships, so the destination VMs must be in ASG-Api.
Clue confirmation
The clue word "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Change the destination port to 443 because ASGs only work with common HTTPS traffic.
Why it's wrong here
ASGs support many ports; the problem is missing ASG membership, not the chosen port.
✗
Create a service endpoint for the spoke subnet so the NSG rule becomes effective.
Why it's wrong here
Service endpoints are for PaaS service access and do not activate ASG-based security rules.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume ASGs automatically include all VMs in the same subnet, but ASGs require explicit NIC membership and do not inherit subnet scope.
Detailed technical explanation
How to think about this question
Application security groups (ASGs) are evaluated at the NIC level, not the subnet level. When an NSG rule specifies an ASG as the destination, Azure's network stack checks the destination IP against the IP addresses of all NICs in that ASG. If a NIC is not a member, its IP is not included in the rule's match set, even if it resides in the same subnet. This is critical in multi-tier architectures where you want to restrict traffic to specific VMs without hardcoding IP addresses.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
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: Add the API VM NICs to ASG-Api. — The NSG rule references ASG-Api as the destination, but the API VM NICs were never added to that application security group. ASGs are logical groupings of VM NICs; a rule targeting an ASG only applies to NICs that are members of that ASG. Since the API NICs are not in ASG-Api, the rule does not match them, and traffic fails. Adding the API VM NICs to ASG-Api resolves the issue by making them valid destinations for the 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.
Are there clue words in this question I should notice?
Yes — watch for: "never". Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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