AZ-500 Practice Question: NSGs have default rules that cannot be removed.
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 rules that cannot be removed.. 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. They want to allow inbound HTTPS traffic from any source on the internet (0.0.0.0/0) and block all other inbound traffic. They associate a network security group (NSG) with the subnet. What is the minimum number of inbound security rules required to achieve this?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
One inbound rule allowing HTTPS from Internet.
Option B is correct because an NSG includes a set of default security rules that already block all inbound traffic not explicitly allowed. By adding a single inbound rule that allows HTTPS (TCP port 443) from the Internet (0.0.0.0/0), the default deny rule (DenyAllInbound) will block all other inbound traffic. Therefore, only one custom inbound rule is required to achieve the stated goal.
Key principle: NSGs have default rules that cannot be removed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
One inbound rule allowing HTTPS from Internet, and one inbound rule DenyAllInbound.
Why it's wrong here
The explicit deny rule is unnecessary because the default rule already denies all inbound traffic.
✓
One inbound rule allowing HTTPS from Internet.
Why this is correct
The default NSG rules deny all inbound traffic; adding an allow rule for HTTPS is sufficient.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
NSGs have default rules that cannot be removed.
✗
Two inbound rules: one allowing HTTPS from Internet, one allowing HTTP from Internet.
Why it's wrong here
Only HTTPS is required; HTTP is not needed and would allow unwanted traffic.
✗
Two inbound rules: one allowing HTTPS from Internet, one allowing RDP from Internet.
Why it's wrong here
RDP should not be allowed from the internet.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often forget about the default NSG rules, especially the 'DenyAllInbound' rule, and incorrectly assume they must add an explicit deny rule to block all other traffic.
Detailed technical explanation
How to think about this question
Azure NSGs have five default inbound rules, including a rule named 'DenyAllInbound' with priority 65500 that blocks all traffic not matching a higher-priority allow rule. When you create a custom allow rule for HTTPS (TCP/443) with a priority lower than 65500 (e.g., 100), it overrides the default deny for that specific traffic, while the default deny continues to block everything else. This design minimizes the number of rules needed and ensures that only explicitly allowed traffic is permitted.
KKey Concepts to Remember
NSGs have default rules that cannot be removed.
The default inbound rule 'DenyAllInbound' has a priority of 65500.
Custom NSG rules are processed by priority, lowest number first.
An explicit 'Allow' rule with a lower priority overrides a default 'Deny' rule.
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 rules that cannot be removed.
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-500 question in full detail.
Secure networking — This question tests Secure networking — NSGs have default rules that cannot be removed..
What is the correct answer to this question?
The correct answer is: One inbound rule allowing HTTPS from Internet. — Option B is correct because an NSG includes a set of default security rules that already block all inbound traffic not explicitly allowed. By adding a single inbound rule that allows HTTPS (TCP port 443) from the Internet (0.0.0.0/0), the default deny rule (DenyAllInbound) will block all other inbound traffic. Therefore, only one custom inbound rule is required to achieve the stated goal.
What should I do if I get this AZ-500 question wrong?
Review nSGs have default rules that cannot be removed., then practise related AZ-500 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
NSGs have default rules that cannot be removed.
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