Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
You have an Azure virtual machine that hosts a web application on port 443 and a management interface on port 8443. You need to allow inbound HTTPS traffic from the internet to port 443, and allow inbound traffic on port 8443 only from the company's office public IP range (203.0.113.0/24). You want to use a managed service that provides basic DDoS protection at no additional cost. What should you use?
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
Azure Application Gateway with WAF
Azure Application Gateway is a Layer 7 load balancer that includes Web Application Firewall (WAF), but it is a paid service with additional cost. It is not required for basic IP/port filtering.
B
Distractor review
Azure Front Door
Azure Front Door is a global load balancer and application delivery controller. It is a paid service and introduces unnecessary complexity for simple inbound traffic filtering to a single VM.
C
Distractor review
Azure Firewall
Azure Firewall is a managed, stateful firewall service that provides advanced features like threat intelligence and FQDN filtering. It incurs additional cost and is more complex than needed for this use case.
D
Best answer
Network Security Group (NSG)
An NSG can be associated with the VM's subnet or network interface. You can create rules to allow inbound HTTPS on port 443 from any source, and allow inbound on port 8443 only from the office IP range. NSGs are free and the default DDoS Protection Basic is included at no additional cost.
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.
Question 1
A DevOps team wants Defender for Cloud to identify secrets exposed in GitHub repositories. What should be configured?
Question 2
A public web application should be protected from OWASP-style attacks and network-layer DDoS attacks. Which two Azure services are most relevant?
Question 3
A Sentinel scheduled rule runs every 5 minutes and looks back 1 hour. Analysts see repeated alerts for the same event. Which change best prevents duplicate detections without missing late-arriving logs?
Question 4
A SOC analyst needs a Sentinel query that detects multiple failed sign-ins followed by a successful sign-in for the same user. Which table is the best primary source?
Question 5
A Sentinel watchlist contains high-value administrator accounts. Which KQL pattern best uses it in a detection rule?
Question 6
A SOC wants a Sentinel rule to include account, host, and IP entities so analysts can pivot during investigation. What should be configured in the analytics rule?
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: Network Security Group (NSG) — A Network Security Group (NSG) is a free, built-in firewall that can filter inbound traffic based on source IP and port. Azure provides DDoS Protection Basic automatically for all public IPs at no extra cost. NSGs are associated with subnets or network interfaces and allow you to create rules for the required traffic patterns. Azure Application Gateway, Azure Front Door, and Azure Firewall are paid services that provide additional features but are not necessary for this simple scenario and cost more.
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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