Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
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
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
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
Distractor review
Two inbound rules: one to allow HTTPS, and one to deny all other traffic
An explicit deny rule is unnecessary because NSGs already have a default deny rule that blocks everything not allowed.
C
Distractor review
Three inbound rules: allow HTTPS, allow RDP for management, and deny all
RDP is not mentioned and should not be allowed. Adding extra rules is not minimal and violates the requirement.
D
Distractor review
One inbound rule: Allow TCP port 443 from source 'Any' and a separate rule to deny from '198.51.100.0/24'
This would allow HTTPS from all sources and then deny from the specified range, which is the opposite of the requirement.
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: One inbound rule: Allow TCP port 443 from source '198.51.100.0/24' — NSGs have a default deny rule that blocks all inbound traffic not explicitly allowed. To allow HTTPS from a specific range, you need one allow rule for TCP port 443 with source IP range 198.51.100.0/24. No other inbound rules are needed because the default deny blocks everything else.
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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