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.
A subnet NSG contains a deny inbound rule for TCP 3389 from Any at priority 100 and an allow inbound rule for TCP 3389 from 10.4.1.0/24 at priority 200. Admin workstations in 10.4.1.0/24 cannot connect by RDP. What change should the administrator make?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Lower the allow rule priority number so it is evaluated before the deny rule.
The correct answer is C because NSG rules are evaluated in priority order, with lower numbers having higher priority. The deny rule at priority 100 blocks all TCP 3389 traffic from Any, and the allow rule at priority 200 is never reached. Lowering the allow rule's priority number (e.g., to 90) ensures it is evaluated before the deny rule, allowing RDP traffic from 10.4.1.0/24.
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.
✗
Replace the source IP range with an application security group in the allow rule.
Why it's wrong here
Source grouping helps manageability, but it does not fix a higher-priority deny rule.
✗
Change the protocol from TCP to Any in the allow rule.
Why it's wrong here
The rule already matches RDP traffic; protocol broadening does not change priority order.
✓
Lower the allow rule priority number so it is evaluated before the deny rule.
Why this is correct
NSG rules are evaluated from lowest number to highest, so the allow must come first.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add a user-defined route to the subnet so RDP traffic bypasses the NSG.
Why it's wrong here
Routing changes do not bypass NSG filtering, because NSGs still evaluate the packet.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume allow rules automatically override deny rules, but Azure NSGs use first-match evaluation based on priority numbers, not rule type.
Detailed technical explanation
How to think about this question
Azure NSGs process rules in ascending priority order (lowest number first) and stop at the first match; a deny rule at priority 100 for TCP 3389 from Any will block all RDP traffic, including from 10.4.1.0/24, before the allow rule at priority 200 is evaluated. This is a common misconfiguration where administrators assume allow rules override deny rules, but in Azure, the first matching rule applies, and deny rules take precedence if they appear earlier. In real-world scenarios, always plan priority numbering with gaps (e.g., 100, 200, 300) to allow insertion of new rules without renumbering.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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: Lower the allow rule priority number so it is evaluated before the deny rule. — The correct answer is C because NSG rules are evaluated in priority order, with lower numbers having higher priority. The deny rule at priority 100 blocks all TCP 3389 traffic from Any, and the allow rule at priority 200 is never reached. Lowering the allow rule's priority number (e.g., to 90) ensures it is evaluated before the deny rule, allowing RDP traffic from 10.4.1.0/24.
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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