Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company has an Azure virtual network with a subnet that hosts a web application. They need to allow inbound HTTP (port 80) and HTTPS (port 443) traffic from a specific source IP range (203.0.113.0/24) to the web servers. Additionally, they need to allow inbound RDP (port 3389) traffic from a management subnet (10.0.1.0/24). They want to block all other inbound traffic. They are using a network security group (NSG) associated with the subnet. What is the minimum number of inbound security rules required?
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
Best answer
3
Three allow rules (HTTP, HTTPS, RDP) are sufficient. The default deny rule handles all other inbound traffic.
B
Distractor review
4
Four rules would be excessive; a rule to deny all traffic is unnecessary because the default deny already exists.
C
Distractor review
5
Five rules are not needed; only three allow rules are required.
D
Distractor review
2
Two rules are insufficient because three separate services (HTTP, HTTPS, RDP) must be allowed from different source addresses.
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: 3 — NSGs have a default deny inbound rule. Therefore, only three allow rules are needed: one for HTTP, one for HTTPS, and one for RDP. No explicit deny rules are required because the default deny already covers all other traffic. Adding a deny rule would be redundant.
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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