The answer is Azure Application Gateway with Web Application Firewall (WAF) for web app protection. This service is the correct choice because it operates at Layer 7, inspecting HTTPS traffic on TCP port 443 and using WAF rules to block common web attacks like SQL injection and cross-site scripting before they reach your Azure Virtual Machines, thereby minimizing the attack surface. On the Microsoft Azure Security Engineer Associate AZ-500 exam, this scenario tests your ability to distinguish between network-layer and application-layer security controls—a common trap is choosing Azure Firewall or Network Security Groups, which lack the deep packet inspection and WAF capabilities needed for web-specific threats. Remember that Application Gateway with WAF is the only Azure service that combines regional load balancing with a managed WAF for inbound web traffic. A useful memory tip: think "WAF for web apps, NSG for subnets, Firewall for general network filtering."
AZ-500 Secure networking Practice Question
This AZ-500 practice question tests your understanding of secure networking. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You are designing a network security strategy for a new application that will be hosted on Azure Virtual Machines. The application must be accessible from the internet on TCP port 443. You need to minimize the attack surface and ensure that only legitimate traffic reaches the virtual machines. Which Azure service should you deploy in front of the virtual machines?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Application Gateway with Web Application Firewall (WAF).
Option A is correct: Azure Application Gateway with Web Application Firewall (WAF) provides Layer 7 load balancing and WAF capabilities to protect against web attacks. Option B is incorrect because Network Security Groups are not deployed in front of VMs as a service; they are applied at the subnet or NIC level. Option C is incorrect because Azure Firewall is a stateful firewall but lacks WAF capabilities for web-specific threats. Option D is incorrect because Azure Front Door is a global load balancer, but for a single region, Application Gateway is more appropriate for minimizing attack surface with WAF.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Azure Front Door with WAF.
Why it's wrong here
Front Door provides global load balancing and WAF, but for a single-region app, Application Gateway is simpler.
✗
Azure Firewall.
Why it's wrong here
Azure Firewall is a stateful firewall but lacks WAF capabilities for web traffic.
✗
Network Security Group (NSG) on the subnet.
Why it's wrong here
NSGs provide stateful filtering but no application-layer inspection or WAF.
✓
Azure Application Gateway with Web Application Firewall (WAF).
Why this is correct
Provides Layer 7 protection and WAF to filter malicious traffic.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
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.
Detailed technical explanation
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.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-500 question in full detail.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-500 subnetting questions on CIDR, address ranges, and subnet selection.
Secure networking — This question tests Secure networking — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Azure Application Gateway with Web Application Firewall (WAF). — Option A is correct: Azure Application Gateway with Web Application Firewall (WAF) provides Layer 7 load balancing and WAF capabilities to protect against web attacks. Option B is incorrect because Network Security Groups are not deployed in front of VMs as a service; they are applied at the subnet or NIC level. Option C is incorrect because Azure Firewall is a stateful firewall but lacks WAF capabilities for web-specific threats. Option D is incorrect because Azure Front Door is a global load balancer, but for a single region, Application Gateway is more appropriate for minimizing attack surface with WAF.
What should I do if I get this AZ-500 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-500 subnetting questions on CIDR, address ranges, and subnet selection.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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