The answer is Azure Front Door. This service is the correct choice because it provides global load balancing with integrated WAF and failover by routing user traffic to the nearest Azure region based on geographic location and latency, while automatically redirecting requests if a region becomes unavailable. On the Microsoft Azure Fundamentals AZ-900 exam, this scenario tests your understanding of Azure’s global networking services, often contrasting Azure Front Door with Azure Traffic Manager or Application Gateway. A common trap is choosing Traffic Manager, which also offers geographic routing and failover but lacks native Web Application Firewall (WAF) integration; Azure Front Door combines both at the edge. Remember the memory tip: “Front Door guards the front with WAF and fails over fast.”
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.
A global e-commerce platform runs on Azure App Service in multiple regions. They need to route user traffic to the nearest region based on geographic location, and also provide automatic failover if a region becomes unavailable. Which Azure service includes these capabilities with integrated Web Application Firewall (WAF)?
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 uses the Microsoft global edge network to route user traffic to the nearest region based on geographic location (latency-based routing) and provides automatic failover across regions. It natively integrates Web Application Firewall (WAF) at the edge, protecting against common web exploits like SQL injection and cross-site scripting, making it the correct choice for this scenario.
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 Traffic Manager
Why it's wrong here
Traffic Manager provides DNS-based routing and failover but does not include WAF or HTTP-level features.
✓
Azure Front Door
Why this is correct
Front Door provides global load balancing, geographic routing, failover, and integrated WAF.
Related concept
Read the scenario before looking for a memorised answer.
Load Balancer is a regional layer 4 load balancer without WAF or geographic routing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Traffic Manager's DNS-based global routing with Azure Front Door's application-layer global routing and WAF integration, assuming Traffic Manager can also provide WAF protection, which it cannot.
Detailed technical explanation
How to think about this question
Azure Front Door uses Anycast protocol to route traffic to the nearest point of presence (PoP) on the Microsoft global network, enabling sub-50ms failover via health probes. Its WAF policies can be configured with custom rules and managed rule sets (e.g., OWASP 3.2) to filter malicious traffic before it reaches the origin. In a real-world scenario, if a primary region's App Service becomes unhealthy, Front Door automatically reroutes traffic to the next closest healthy region without DNS propagation delays.
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 uses the Microsoft global edge network to route user traffic to the nearest region based on geographic location (latency-based routing) and provides automatic failover across regions. It natively integrates Web Application Firewall (WAF) at the edge, protecting against common web exploits like SQL injection and cross-site scripting, making it the correct choice for this scenario.
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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