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.
A company deploys a web application on Azure VMs behind an Azure Load Balancer (Standard SKU). They want to protect the application from common web attacks like SQL injection and cross-site scripting. Which Azure service should they enable?
Azure Application Gateway with Web Application Firewall (WAF) policy.
WAF is designed to inspect HTTP traffic and block common web attacks. Application Gateway provides Layer 7 load balancing with WAF capabilities.
B
Azure Firewall.
Why wrong: Azure Firewall provides network and application-level filtering based on FQDNs, but it does not have a WAF for inspecting web traffic payloads.
C
Network Security Groups on the VM subnet.
Why wrong: NSGs provide stateful filtering of network traffic based on IP, port, and protocol, but they cannot inspect application layer payloads like HTTP requests.
D
Azure DDoS Protection.
Why wrong: Azure DDoS Protection mitigates large-scale volumetric attacks, not application-layer attacks like SQL injection.
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) policy.
Azure Application Gateway with a Web Application Firewall (WAF) policy is the correct choice because it operates at Layer 7 (HTTP/HTTPS) and provides centralized, inbound protection against common web attacks such as SQL injection and cross-site scripting (XSS). The WAF policy uses OWASP Core Rule Sets (CRS) to inspect HTTP request payloads and headers, blocking malicious traffic before it reaches the backend VMs behind the Load Balancer.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 Application Gateway with Web Application Firewall (WAF) policy.
Why this is correct
WAF is designed to inspect HTTP traffic and block common web attacks. Application Gateway provides Layer 7 load balancing with WAF capabilities.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Firewall.
Why it's wrong here
Azure Firewall provides network and application-level filtering based on FQDNs, but it does not have a WAF for inspecting web traffic payloads.
✗
Network Security Groups on the VM subnet.
Why it's wrong here
NSGs provide stateful filtering of network traffic based on IP, port, and protocol, but they cannot inspect application layer payloads like HTTP requests.
✗
Azure DDoS Protection.
Why it's wrong here
Azure DDoS Protection mitigates large-scale volumetric attacks, not application-layer attacks like SQL injection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Azure Firewall (a Layer 3-4 network firewall) with a web application firewall, mistakenly believing it can inspect HTTP payloads, when in fact only a Layer 7 WAF (like Application Gateway WAF or Azure Front Door WAF) can protect against SQL injection and XSS.
Detailed technical explanation
How to think about this question
Under the hood, the WAF on Application Gateway integrates with the OWASP ModSecurity Core Rule Set (CRS), which includes specific rules (e.g., rule 942100 for SQL injection attempts) that analyze HTTP request bodies, cookies, and query strings. In a real-world scenario, if an attacker sends a request with a malicious SQL payload in a form field, the WAF inspects the payload against the CRS and either blocks, logs, or allows the request based on the configured policy mode (Prevention vs. Detection). This is distinct from a Load Balancer, which only distributes traffic without inspecting content.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-500 question in full detail.
Secure networking — This question tests Secure networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Application Gateway with Web Application Firewall (WAF) policy. — Azure Application Gateway with a Web Application Firewall (WAF) policy is the correct choice because it operates at Layer 7 (HTTP/HTTPS) and provides centralized, inbound protection against common web attacks such as SQL injection and cross-site scripting (XSS). The WAF policy uses OWASP Core Rule Sets (CRS) to inspect HTTP request payloads and headers, blocking malicious traffic before it reaches the backend VMs behind the Load Balancer.
What should I do if I get this AZ-500 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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