Question 446 of 1,000

Secure networking →easyMultiple ChoiceObjective-mapped

AZ-500 Secure networking Practice Question

This AZ-500 practice question tests your understanding of secure networking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 deploys Azure virtual machines in a virtual network. A security policy requires that only Remote Desktop Protocol (RDP) traffic from the corporate VPN's public IP address (203.0.113.0/26) is allowed. All other inbound RDP traffic must be denied. Which configuration should be applied to the network security group (NSG) associated with the VM subnet?

Question 1easymultiple choice

Read the full VPN explanation →

A
Add an inbound rule to allow RDP from the Internet and a deny rule for RDP from the corporate IP.
Why wrong: This would allow RDP from the internet and block the corporate IP, which is the opposite of the requirement.
B
Add an inbound rule to deny RDP from the corporate IP and a default deny all inbound.
Why wrong: This denies the corporate IP and denies all other traffic, but the requirement is to allow corporate IP.
C
Add an inbound rule to allow RDP from the corporate IP range, and add a default deny rule for all other inbound RDP traffic.
This correctly allows RDP from the corporate IP and denies RDP from all other sources. The deny rule should have a higher priority number (lower priority) than the allow rule.
D
No additional rules are needed because the default NSG rules already deny RDP.
Why wrong: Default NSG rules allow all outbound traffic and deny all inbound from the internet, but they do not allow RDP from any source. A specific allow rule for the corporate IP is needed.

Full breakdown with real-world context →

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

✓

Add an inbound rule to allow RDP from the corporate IP range, and add a default deny rule for all other inbound RDP traffic.

Option C is correct because the requirement is to allow RDP (TCP port 3389) only from the corporate VPN's public IP range (203.0.113.0/26) and deny all other inbound RDP traffic. An NSG processes rules in priority order; by adding an inbound allow rule for the corporate IP range with a high priority (e.g., 100) and relying on the default deny rule (which denies all inbound traffic not explicitly allowed), only RDP from the specified range is permitted. This matches the security policy precisely.

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.

✗
Add an inbound rule to allow RDP from the Internet and a deny rule for RDP from the corporate IP.
Why it's wrong here
This would allow RDP from the internet and block the corporate IP, which is the opposite of the requirement.
✗
Add an inbound rule to deny RDP from the corporate IP and a default deny all inbound.
Why it's wrong here
This denies the corporate IP and denies all other traffic, but the requirement is to allow corporate IP.
✓
Add an inbound rule to allow RDP from the corporate IP range, and add a default deny rule for all other inbound RDP traffic.
Why this is correct
This correctly allows RDP from the corporate IP and denies RDP from all other sources. The deny rule should have a higher priority number (lower priority) than the allow rule.
Related concept
Read the scenario before looking for a memorised answer.
✗
No additional rules are needed because the default NSG rules already deny RDP.
Why it's wrong here
Default NSG rules allow all outbound traffic and deny all inbound from the internet, but they do not allow RDP from any source. A specific allow rule for the corporate IP is needed.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often forget that NSGs have default rules that allow inbound traffic from the virtual network and Azure load balancer, and they mistakenly think a default deny rule already blocks all RDP, when in fact you must explicitly allow the specific source IP and rely on the default deny to block everything else.

Detailed technical explanation

How to think about this question

NSG rules are evaluated in priority order (lowest number first) until a match is found; once a rule matches, no further rules are processed. The default inbound rules include 'AllowVNetInBound' (priority 65000) and 'AllowAzureLoadBalancerInBound' (priority 65001), followed by 'DenyAllInbound' (priority 65500). To allow RDP only from a specific public IP, you must add a higher-priority allow rule (e.g., priority 100) for that IP range on port 3389; the default deny rule then blocks all other inbound RDP traffic. This behavior is defined in Azure's NSG documentation and is critical for implementing least-privilege network access.

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: Add an inbound rule to allow RDP from the corporate IP range, and add a default deny rule for all other inbound RDP traffic. — Option C is correct because the requirement is to allow RDP (TCP port 3389) only from the corporate VPN's public IP range (203.0.113.0/26) and deny all other inbound RDP traffic. An NSG processes rules in priority order; by adding an inbound allow rule for the corporate IP range with a high priority (e.g., 100) and relying on the default deny rule (which denies all inbound traffic not explicitly allowed), only RDP from the specified range is permitted. This matches the security policy precisely.

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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