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 contains two NSGs: one associated with the subnet and one associated with the NIC of VM-App03. You need to determine whether inbound TCP 3389 from the internet is allowed. What is the correct interpretation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The effective rules are determined by evaluating both NSGs together, and a deny in either applicable path can block access.
When a subnet NSG and a NIC NSG are both applied, Azure evaluates the effective rules by combining both NSGs. Inbound traffic must be allowed by both NSGs along the traffic path; if either NSG has a deny rule that matches the traffic (e.g., a default deny rule for inbound internet traffic), the traffic is blocked. Option C correctly states that a deny in either applicable path can block access, which is the fundamental behavior of NSG evaluation in Azure.
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.
✗
The NIC NSG always overrides the subnet NSG.
Why it's wrong here
Effective security rules consider both; there is no blanket NIC override rule.
✗
Inbound traffic is allowed as long as one NSG has an allow rule.
Why it's wrong here
Traffic can still be denied by a higher-priority deny in either applicable rule set.
✓
The effective rules are determined by evaluating both NSGs together, and a deny in either applicable path can block access.
Why this is correct
This reflects how effective NSG rules are evaluated for a VM NIC and its subnet.
Related concept
Read the scenario before looking for a memorised answer.
✗
Subnet NSGs apply only to outbound traffic.
Why it's wrong here
Subnet NSGs can apply to both inbound and outbound traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the NIC NSG overrides the subnet NSG (Option A) or that an allow in one NSG is sufficient (Option B), but Azure requires both NSGs to permit the traffic for it to be allowed.
Detailed technical explanation
How to think about this question
Under the hood, Azure evaluates NSG rules in order of priority (lower number = higher priority) for each NSG separately, then combines the results: if either NSG has a deny rule that matches the traffic, the traffic is denied. This is similar to a 'deny overrides allow' model across multiple NSGs. In a real-world scenario, if a subnet NSG has a default deny-all inbound rule and the NIC NSG has an allow rule for RDP (3389), the traffic is still blocked because the subnet NSG's deny takes precedence.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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: The effective rules are determined by evaluating both NSGs together, and a deny in either applicable path can block access. — When a subnet NSG and a NIC NSG are both applied, Azure evaluates the effective rules by combining both NSGs. Inbound traffic must be allowed by both NSGs along the traffic path; if either NSG has a deny rule that matches the traffic (e.g., a default deny rule for inbound internet traffic), the traffic is blocked. Option C correctly states that a deny in either applicable path can block access, which is the fundamental behavior of NSG evaluation in Azure.
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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Question Discussion
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