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A global retail company hosts its e-commerce web application on Azure virtual machines in three Azure regions: West Europe, East US, and Southeast Asia. The application must provide a single HTTPS entry point for customers worldwide. The company requires the solution to: route each user to the region that provides the best performance (lowest latency), automatically redirect traffic to a healthy region if one becomes unavailable, and protect the application from common web vulnerabilities such as SQL injection and cross-site scripting (XSS) by inspecting all incoming HTTP/HTTPS traffic at the edge. Which Azure service should the company use?

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A global retail company hosts its e-commerce web application on Azure virtual machines in three Azure regions: West Europe, East US, and Southeast Asia. The application must provide a single HTTPS entry point for customers worldwide. The company requires the solution to: route each user to the region that provides the best performance (lowest latency), automatically redirect traffic to a healthy region if one becomes unavailable, and protect the application from common web vulnerabilities such as SQL injection and cross-site scripting (XSS) by inspecting all incoming HTTP/HTTPS traffic at the edge. Which Azure service should the company use?

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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 Traffic Manager with a Web Application Firewall (WAF) policy applied to each backend virtual machine

Azure Traffic Manager is a DNS-based traffic routing service that directs traffic to different endpoints based on routing methods such as performance (latency), but it does not inspect HTTP/HTTPS traffic because it operates at the DNS layer. A WAF policy applied at the backend VMs would still not inspect traffic at the edge before it reaches the VMs, and managing per-VM WAF policies would be inefficient.

B

Best answer

Azure Front Door

Azure Front Door is a global application delivery network that provides intelligent HTTP/HTTPS load balancing, SSL offload, URL-based routing, and latency-based routing to the closest healthy region. It also includes a built-in Web Application Firewall (WAF) that inspects all incoming traffic at the edge, protecting against common web exploits like SQL injection and XSS.

C

Distractor review

Azure Application Gateway

Azure Application Gateway is a regional application load balancer that provides HTTP/HTTPS load balancing, SSL termination, and WAF capabilities. However, it is confined to a single Azure region and cannot route traffic globally based on user latency or perform cross-region failover.

D

Distractor review

Azure Load Balancer

Azure Load Balancer operates at layer 4 (TCP/UDP) of the OSI model and cannot inspect or route HTTP/HTTPS traffic based on URL paths, hostnames, or latency. Additionally, it does not include a Web Application Firewall (WAF) and is designed for regional load balancing within a single region.

Common exam trap

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Technical deep dive

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
  • Use explanations to understand the rule behind the answer.

TExam Day Tips

  • Underline the problem statement mentally.
  • 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.

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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 developer is building a serverless application that requires integration with an on-premises SQL Server database for real-time data processing. The on-premises network is connected to Azure via a site-to-site VPN. Which Azure service would allow the function to securely access the on-premises database without exposing it to the public internet?

Question 2

A solutions architect is designing a storage solution for a large media company. The company needs to store video files that are accessed infrequently but must be retained for several years for compliance. Which two Azure storage options meet these requirements? (Select two.)

Question 3

A company deploys a multi-tier application using Azure virtual machines. The web tier VMs must be evenly distributed across two distinct data centers within an Azure region to avoid a single point of failure from an infrastructure outage. Which Azure construct should they use to meet this requirement?

Question 4

A company wants to enforce a set of security policies across all their Azure subscriptions. They have created several individual policy definitions. Which Azure construct should they use to group these policies together and assign them as a single package?

Question 5

A company deploys a line-of-business application on an Azure virtual machine. The IT team wants to ensure the application remains secure. According to the shared responsibility model, which of the following security tasks is the sole responsibility of the customer (the company)?

Question 6

A company develops a web API that runs on Azure App Service. The development team wants to deploy a new version of the API to a staging environment, run integration tests against it, and then gradually shift production traffic to the new version. If any issues are detected, they want to immediately roll back to the previous version without redeploying. Which Azure App Service feature should the team use to meet these requirements?

FAQ

Questions learners often ask

What does this AZ-900 question test?

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 HTTP/HTTPS load balancing, SSL offload, URL-based routing, latency-based routing, and an integrated Web Application Firewall (WAF) at the edge. This meets all the requirements: global multi-region routing, automatic failover, and edge-based traffic inspection for web vulnerabilities. Azure Traffic Manager is DNS-based and cannot inspect HTTP traffic. Azure Application Gateway is a regional load balancer and does not provide global latency-based routing. Azure Load Balancer operates at layer 4 (TCP/UDP) and lacks WAF capabilities.

What should I do if I get this AZ-900 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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