The answer is Azure Front Door. This service is the correct choice because it functions as a global, scalable entry point that combines a content delivery network with built-in DDoS protection and Web Application Firewall capabilities, operating at Layer 7 to accelerate and secure web applications using Microsoft’s global edge network. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of how Azure Front Door differs from a standard CDN by integrating intelligent traffic routing, SSL termination, and application-layer security into a single service—a common trap is confusing it with Azure CDN alone, which lacks the integrated WAF and global load balancing. Remember the memory tip: Front Door is your “front door” for the world, combining CDN, DDoS, and WAF under one roof.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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.
Which Azure service provides a globally distributed content delivery network with DDoS protection and Web Application Firewall capabilities?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Front Door
Azure Front Door is a global, scalable entry point that provides a content delivery network (CDN) with built-in DDoS protection and Web Application Firewall (WAF) capabilities. It operates at Layer 7 (HTTP/HTTPS) and uses Microsoft's global edge network to accelerate and secure web applications. Unlike a standard CDN, Front Door integrates intelligent traffic routing, SSL termination, and application-layer security in a single service.
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 CDN with WAF
Why it's wrong here
Azure CDN provides content delivery; Front Door integrates global load balancing, WAF, and DDoS in one service.
✗
Azure Application Gateway
Why it's wrong here
Application Gateway is regional; Front Door provides global capabilities with WAF and DDoS.
✓
Azure Front Door
Why this is correct
Front Door provides global load balancing, caching, WAF, and DDoS protection at the edge on Microsoft's global network.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure DDoS Protection Standard
Why it's wrong here
DDoS Protection Standard protects virtual networks; Front Door provides edge-level protection with more features.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Azure Front Door with Azure CDN or Application Gateway, not realizing that Front Door uniquely combines global CDN, WAF, and DDoS protection in a single service, whereas the others are either regional or lack integrated security features.
Detailed technical explanation
How to think about this question
Azure Front Door uses Anycast routing to direct user traffic to the nearest edge point of presence (PoP) among over 150 global locations, reducing latency. Its WAF integrates with OWASP core rule sets and can be customized with managed rules, while DDoS protection is enabled at the edge via Azure's global network infrastructure, mitigating attacks before they reach the origin. A real-world scenario is an e-commerce platform requiring low-latency content delivery, SSL offloading, and protection against SQL injection and DDoS attacks, all managed through a single Front Door instance.
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
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Front Door — Azure Front Door is a global, scalable entry point that provides a content delivery network (CDN) with built-in DDoS protection and Web Application Firewall (WAF) capabilities. It operates at Layer 7 (HTTP/HTTPS) and uses Microsoft's global edge network to accelerate and secure web applications. Unlike a standard CDN, Front Door integrates intelligent traffic routing, SSL termination, and application-layer security in a single service.
What should I do if I get this AZ-900 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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Question Discussion
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