- A
A rule allowing HTTPS from Internet, and a default deny all rule.
Why wrong: NSGs already have a default deny-all inbound rule; adding an explicit deny rule is unnecessary and does not represent the minimal set.
- B
A rule allowing HTTPS from Internet, and no other rules (default deny all inbound).
Correct. The default NSG rules deny all inbound internet traffic. Adding only an allow rule for HTTPS is sufficient.
- C
A rule allowing HTTPS from Internet, and a rule explicitly denying all other inbound traffic.
Why wrong: An explicit deny rule is redundant because the default deny already blocks all other traffic. This is not minimal.
- D
A rule allowing HTTPS from any source, and a rule denying all other traffic with lower priority.
Why wrong: Including an explicit deny rule is unnecessary. Also, the rule allowing HTTPS from any source would include traffic from the internet, but the explicit deny is not needed.
AZ-500 NSGs have default inbound and outbound rules. Practice Question
This AZ-500 practice question tests your understanding of secure 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. A key principle to apply: nSGs have default inbound and outbound rules.. 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 company has an Azure virtual network with a subnet that hosts a web application. The security team wants to allow inbound HTTPS traffic (port 443) from the internet to the web servers, but block all other inbound traffic. They have a network security group (NSG) associated with the subnet. What is the minimal set of inbound rules required?
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
A rule allowing HTTPS from Internet, and no other rules (default deny all inbound).
Network security groups (NSGs) in Azure have a default deny-all inbound rule (rule 65500) that is automatically applied to all inbound traffic. Therefore, you only need to add an explicit allow rule for HTTPS (port 443) from the Internet. No additional deny rule is required because the default rule already blocks all other inbound traffic.
Key principle: NSGs have default inbound and outbound rules.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A rule allowing HTTPS from Internet, and a default deny all rule.
Why it's wrong here
NSGs already have a default deny-all inbound rule; adding an explicit deny rule is unnecessary and does not represent the minimal set.
- ✓
A rule allowing HTTPS from Internet, and no other rules (default deny all inbound).
Why this is correct
Correct. The default NSG rules deny all inbound internet traffic. Adding only an allow rule for HTTPS is sufficient.
Related concept
NSGs have default inbound and outbound rules.
- ✗
A rule allowing HTTPS from Internet, and a rule explicitly denying all other inbound traffic.
Why it's wrong here
An explicit deny rule is redundant because the default deny already blocks all other traffic. This is not minimal.
- ✗
A rule allowing HTTPS from any source, and a rule denying all other traffic with lower priority.
Why it's wrong here
Including an explicit deny rule is unnecessary. Also, the rule allowing HTTPS from any source would include traffic from the internet, but the explicit deny is not needed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think they must add an explicit deny rule to block all other traffic, not realizing that Azure NSGs already include a default deny-all inbound rule that is automatically applied at the lowest priority.
Detailed technical explanation
How to think about this question
Azure NSGs evaluate rules in priority order (lowest number = highest priority) and apply the first matching rule. The default inbound rule (65500) denies all traffic that does not match a higher-priority allow rule. This means that even if you add an explicit deny rule with a higher priority (e.g., 4096), it would only be evaluated if no allow rule matches first, but the default deny already covers all unmatched traffic. In practice, the minimal configuration is a single allow rule for HTTPS, relying on the built-in default deny.
KKey Concepts to Remember
- NSGs have default inbound and outbound rules.
- Default inbound rules include a 'DenyAllInbound' rule.
- Custom rules with lower priority override default rules.
- Traffic not explicitly allowed by custom rules is blocked by default deny rules.
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
NSGs have default inbound and outbound rules.
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.
What to study next
Got this wrong? Here's your next step.
Review nSGs have default inbound and outbound rules., then practise related AZ-500 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this AZ-500 question test?
Secure networking — This question tests Secure networking — NSGs have default inbound and outbound rules..
What is the correct answer to this question?
The correct answer is: A rule allowing HTTPS from Internet, and no other rules (default deny all inbound). — Network security groups (NSGs) in Azure have a default deny-all inbound rule (rule 65500) that is automatically applied to all inbound traffic. Therefore, you only need to add an explicit allow rule for HTTPS (port 443) from the Internet. No additional deny rule is required because the default rule already blocks all other inbound traffic.
What should I do if I get this AZ-500 question wrong?
Review nSGs have default inbound and outbound rules., then practise related AZ-500 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
NSGs have default inbound and outbound rules.
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Last reviewed: Jun 11, 2026
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