Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
A company has an Azure virtual network with a subnet that hosts a web application. The security team wants to allow inbound HTTPS traffic (port 443) from the internet to the web servers, but block all other inbound traffic. They have a network security group (NSG) associated with the subnet. What is the minimal set of inbound 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
Distractor review
A rule allowing HTTPS from Internet, and a default deny all rule.
NSGs already have a default deny-all inbound rule; adding an explicit deny rule is unnecessary and does not represent the minimal set.
B
Best answer
A rule allowing HTTPS from Internet, and no other rules (default deny all inbound).
Correct. The default NSG rules deny all inbound internet traffic. Adding only an allow rule for HTTPS is sufficient.
C
Distractor review
A rule allowing HTTPS from Internet, and a rule explicitly denying all other inbound traffic.
An explicit deny rule is redundant because the default deny already blocks all other traffic. This is not minimal.
D
Distractor review
A rule allowing HTTPS from any source, and a rule denying all other traffic with lower priority.
Including an explicit deny rule is unnecessary. Also, the rule allowing HTTPS from any source would include traffic from the internet, but the explicit deny is not 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.
More questions from this exam
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: A rule allowing HTTPS from Internet, and no other rules (default deny all inbound). — Network Security Groups (NSGs) have default inbound and outbound security rules. The default inbound rules deny all inbound traffic from the internet (unless there is an allow rule from a virtual network). Therefore, to allow HTTPS traffic from the internet, you only need to add a single inbound rule to allow port 443 from any source (or from the internet service tag). No explicit deny rule is needed because the default deny already blocks all other traffic. Options suggesting an explicit deny rule are incorrect and unnecessary.
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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