- A
One inbound rule: Allow TCP port 443 from source '198.51.100.0/24'
A single allow rule for HTTPS from the specified IP range is sufficient; the default deny rule handles all other traffic.
- B
Two inbound rules: one to allow HTTPS, and one to deny all other traffic
Why wrong: An explicit deny rule is unnecessary because NSGs already have a default deny rule that blocks everything not allowed.
- C
Three inbound rules: allow HTTPS, allow RDP for management, and deny all
Why wrong: RDP is not mentioned and should not be allowed. Adding extra rules is not minimal and violates the requirement.
- D
One inbound rule: Allow TCP port 443 from source 'Any' and a separate rule to deny from '198.51.100.0/24'
Why wrong: This would allow HTTPS from all sources and then deny from the specified range, which is the opposite of the requirement.
AZ-500 Secure networking 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. 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 company has a virtual network in Azure with a subnet that hosts a web application. They want to allow inbound HTTPS traffic only from a specific source IP range (198.51.100.0/24). They are using Network Security Groups (NSGs) associated with the subnet. What is the minimal set of inbound security 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
One inbound rule: Allow TCP port 443 from source '198.51.100.0/24'
Option A is correct because NSGs have a default implicit 'DenyAllInbound' rule at the lowest priority (65500). Since you only need to allow HTTPS from the specific source IP range, a single inbound rule permitting TCP port 443 from source '198.51.100.0/24' is sufficient. The implicit deny will block all other traffic, including any traffic from other sources or ports, without needing an explicit deny rule.
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.
- ✓
One inbound rule: Allow TCP port 443 from source '198.51.100.0/24'
Why this is correct
A single allow rule for HTTPS from the specified IP range is sufficient; the default deny rule handles all other traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Two inbound rules: one to allow HTTPS, and one to deny all other traffic
Why it's wrong here
An explicit deny rule is unnecessary because NSGs already have a default deny rule that blocks everything not allowed.
- ✗
Three inbound rules: allow HTTPS, allow RDP for management, and deny all
Why it's wrong here
RDP is not mentioned and should not be allowed. Adding extra rules is not minimal and violates the requirement.
- ✗
One inbound rule: Allow TCP port 443 from source 'Any' and a separate rule to deny from '198.51.100.0/24'
Why it's wrong here
This would allow HTTPS from all sources and then deny from the specified range, which is the opposite of the requirement.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think they need an explicit 'deny all' rule to block unwanted traffic, forgetting that NSGs already include an implicit deny rule at the lowest priority, making additional deny rules redundant and unnecessary for the minimal set.
Detailed technical explanation
How to think about this question
NSG rules are evaluated in priority order (lowest number first), and once a match is found, no further rules are processed. The default implicit rules (DenyAllInbound at priority 65500 and AllowVNetInBound at priority 65000) ensure that only explicitly allowed traffic is permitted. In this scenario, the single allow rule for HTTPS from the specific IP range will match inbound traffic from that source on port 443, and all other traffic (including HTTPS from other IPs or any other protocol) will be denied by the implicit deny rule — no explicit deny is needed.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
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FAQ
Questions learners often ask
What does this AZ-500 question test?
Secure networking — This question tests Secure networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: One inbound rule: Allow TCP port 443 from source '198.51.100.0/24' — Option A is correct because NSGs have a default implicit 'DenyAllInbound' rule at the lowest priority (65500). Since you only need to allow HTTPS from the specific source IP range, a single inbound rule permitting TCP port 443 from source '198.51.100.0/24' is sufficient. The implicit deny will block all other traffic, including any traffic from other sources or ports, without needing an explicit deny rule.
What should I do if I get this AZ-500 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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Last reviewed: Jun 11, 2026
This AZ-500 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-500 exam.
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