- A
NSG rules are evaluated from the highest priority number to the lowest priority number.
Why wrong: Azure NSGs evaluate lower priority numbers first, so this statement reverses the actual order.
- B
The deny rule at priority 300 is matched before the allow rule at priority 350.
NSG rules are processed in ascending order, where the lowest priority number wins. In this case, Deny-All-Inbound at 300 is evaluated before the new allow rule at 350. Because the deny rule matches inbound traffic first, the packet is blocked and the later allow rule never gets a chance. The fix is to give the allow rule a lower number than 300 or otherwise narrow the deny rule.
- C
Azure NSGs cannot allow inbound traffic from public IP addresses.
Why wrong: NSGs can absolutely allow traffic from public IPs when the rule scope and priority are configured correctly.
- D
TCP 443 requires an application security group to be used as the source.
Why wrong: Application security groups are optional targeting tools and are not required for allowing HTTPS from a public source IP.
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 NSG contains these inbound rules: Deny-All-Inbound at priority 300, Allow-HTTPS-From-Bastion at priority 200, and Allow-HTTPS-From-AdminIP at priority 350. An administrator expects a management workstation on the internet to connect to a VM over TCP 443, but the connection is blocked. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
The deny rule at priority 300 is matched before the allow rule at priority 350.
NSG rules are evaluated in priority order, from the lowest priority number (highest priority) to the highest priority number (lowest priority). The Allow-HTTPS-From-AdminIP rule at priority 350 is evaluated after the Deny-All-Inbound rule at priority 300. Since the deny rule at priority 300 matches all inbound traffic before the allow rule at priority 350 is evaluated, the traffic is blocked. The administrator's connection from the internet is denied because the deny rule with a lower priority number (300) takes precedence over the allow rule with a higher priority number (350).
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.
- ✗
NSG rules are evaluated from the highest priority number to the lowest priority number.
Why it's wrong here
Azure NSGs evaluate lower priority numbers first, so this statement reverses the actual order.
When this WOULD be correct
This would be correct if the question described a different rule evaluation order, such as in a hypothetical scenario where NSG rules are evaluated from highest to lowest priority number, or if the question asked about the default evaluation order of custom routes instead of NSG rules.
- ✓
The deny rule at priority 300 is matched before the allow rule at priority 350.
Why this is correct
NSG rules are processed in ascending order, where the lowest priority number wins. In this case, Deny-All-Inbound at 300 is evaluated before the new allow rule at 350. Because the deny rule matches inbound traffic first, the packet is blocked and the later allow rule never gets a chance. The fix is to give the allow rule a lower number than 300 or otherwise narrow the deny rule.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure NSGs cannot allow inbound traffic from public IP addresses.
Why it's wrong here
NSGs can absolutely allow traffic from public IPs when the rule scope and priority are configured correctly.
When this WOULD be correct
This would be correct if the question stated that Azure NSGs cannot allow inbound traffic from public IP addresses when the VM is in a virtual network that uses forced tunneling, or if the NSG is associated with a subnet that has a route table directing all traffic to a firewall. In those cases, the NSG rule might be ineffective, but the statement itself is false.
- ✗
TCP 443 requires an application security group to be used as the source.
Why it's wrong here
Application security groups are optional targeting tools and are not required for allowing HTTPS from a public source IP.
When this WOULD be correct
In a scenario where a VM's NIC has an NSG with a rule that specifies an application security group as the source, but the VM is not a member of that ASG, causing traffic to be denied. The question would state that the rule uses an ASG source and the VM is not in the ASG.
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.
✓The deny rule at priority 300 is matched before the allow rule at priority 350.Correct answer▾
Why this is correct
NSG rules are processed in ascending order, where the lowest priority number wins. In this case, Deny-All-Inbound at 300 is evaluated before the new allow rule at 350. Because the deny rule matches inbound traffic first, the packet is blocked and the later allow rule never gets a chance. The fix is to give the allow rule a lower number than 300 or otherwise narrow the deny rule.
✗NSG rules are evaluated from the highest priority number to the lowest priority number.Wrong answer — click to see why▾
Why this is wrong here
NSG rules are evaluated from lowest priority number to highest, meaning a lower number (higher priority) is matched first. Option A states the opposite, which is incorrect.
★ When this WOULD be the correct answer
This would be correct if the question described a different rule evaluation order, such as in a hypothetical scenario where NSG rules are evaluated from highest to lowest priority number, or if the question asked about the default evaluation order of custom routes instead of NSG rules.
Why candidates choose this
Candidates may confuse NSG priority with other numbering systems (e.g., route tables where lower metric is preferred) or mistakenly think higher numbers mean higher priority.
✗Azure NSGs cannot allow inbound traffic from public IP addresses.Wrong answer — click to see why▾
Why this is wrong here
Azure NSGs can allow inbound traffic from public IP addresses by specifying the public IP as the source in the rule. The Allow-HTTPS-From-AdminIP rule at priority 350 is intended to do that, but it is never evaluated because the Deny-All-Inbound rule at priority 300 is matched first.
★ When this WOULD be the correct answer
This would be correct if the question stated that Azure NSGs cannot allow inbound traffic from public IP addresses when the VM is in a virtual network that uses forced tunneling, or if the NSG is associated with a subnet that has a route table directing all traffic to a firewall. In those cases, the NSG rule might be ineffective, but the statement itself is false.
Why candidates choose this
Candidates may mistakenly believe that Azure NSGs only support private IP ranges or that public IPs must be handled differently, confusing NSG capabilities with Azure Firewall or other network security features.
✗TCP 443 requires an application security group to be used as the source.Wrong answer — click to see why▾
Why this is wrong here
TCP 443 (HTTPS) can be allowed from public IP addresses using a standard NSG rule with the source set to 'Any' or a specific public IP address; an application security group is not required for this purpose.
★ When this WOULD be the correct answer
In a scenario where a VM's NIC has an NSG with a rule that specifies an application security group as the source, but the VM is not a member of that ASG, causing traffic to be denied. The question would state that the rule uses an ASG source and the VM is not in the ASG.
Why candidates choose this
Candidates may confuse application security groups with network security groups, thinking that ASGs are mandatory for allowing traffic from the internet, when in fact ASGs are used to group VMs and simplify rule management, not to enable internet connectivity.
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 confuse 'priority' with 'order of evaluation,' mistakenly thinking higher priority numbers are evaluated first, when in fact lower numbers (higher priority) are evaluated first, causing the deny rule to block traffic before the allow rule is checked.
Detailed technical explanation
How to think about this question
Under the hood, Azure NSGs use a priority-based rule evaluation where the first rule that matches the traffic (based on source, destination, port, and protocol) is applied, and no further rules are processed. This means a lower priority number (e.g., 100) is evaluated before a higher priority number (e.g., 200). In this scenario, the Deny-All-Inbound rule at priority 300 matches all inbound traffic, including the administrator's connection, and blocks it before the Allow-HTTPS-From-AdminIP rule at priority 350 is ever considered. A common real-world mistake is placing a broad deny rule at a lower priority than a specific allow rule, inadvertently blocking intended traffic.
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.
Visual reference
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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: The deny rule at priority 300 is matched before the allow rule at priority 350. — NSG rules are evaluated in priority order, from the lowest priority number (highest priority) to the highest priority number (lowest priority). The Allow-HTTPS-From-AdminIP rule at priority 350 is evaluated after the Deny-All-Inbound rule at priority 300. Since the deny rule at priority 300 matches all inbound traffic before the allow rule at priority 350 is evaluated, the traffic is blocked. The administrator's connection from the internet is denied because the deny rule with a lower priority number (300) takes precedence over the allow rule with a higher priority number (350).
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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