Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
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?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Add an inbound rule to allow RDP from the Internet and a deny rule for RDP from the corporate IP.
This would allow RDP from the internet and block the corporate IP, which is the opposite of the requirement.
B
Distractor review
Add an inbound rule to deny RDP from the corporate IP and a default deny all inbound.
This denies the corporate IP and denies all other traffic, but the requirement is to allow corporate IP.
C
Best answer
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
Distractor review
No additional rules are needed because the default NSG rules already deny RDP.
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 trap
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Technical deep dive
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Related practice questions
Related AZ-500 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
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FAQ
Questions learners often ask
What does this AZ-500 question test?
CIDR notation defines the prefix length.
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. — NSG rules are evaluated in priority order. To allow RDP only from a specific IP range and deny all other RDP, you must add an inbound allow rule for the corporate IP range (priority lower than the deny rule) and a higher priority deny rule for RDP from any source. Option C describes this correct approach.
What should I do if I get this AZ-500 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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