AZ-900 Describe Azure architecture and services Practice Question
A company deploys web servers across Azure regions East US and West Europe. The application must automatically direct each user to the region that provides the lowest network latency, and if an entire region becomes unavailable, traffic must be seamlessly redirected to the remaining healthy region. Which Azure service should the company use?
⚠ Common exam trap
Many exam-takers confuse Azure Load Balancer or Application Gateway with Traffic Manager because all three are load balancing services, but only Traffic Manager operates at the DNS level to provide global, cross-region traffic routing and failover based on latency or geographic location.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Traffic Manager
Azure Traffic Manager is a DNS-based traffic load balancer that directs user requests to the nearest available endpoint based on the lowest network latency. It also supports automatic failover: if a region becomes unavailable, Traffic Manager detects the endpoint health failure via health probes and redirects traffic to the remaining healthy region, providing seamless global load balancing and disaster recovery.
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 Load Balancer
Why it's wrong here
Azure Load Balancer operates at Layer 4 (TCP/UDP) and is scoped to a single Azure region, distributing traffic among healthy virtual machines or instances within that region's backend pools. It has no DNS-level control plane and cannot evaluate latency between a user and multiple regions, nor can it perform global failover. Therefore, while it can balance web server load inside one region, it does not satisfy the requirement to steer users to the lowest-latency region across East US and another region.
When this WOULD be correct
A company deploys multiple VMs in the same Azure region behind a load balancer to distribute incoming traffic for high availability and scalability within that region.
- ✗
Azure Application Gateway
Why it's wrong here
Azure Application Gateway is a regional, Layer 7 load balancer that provides HTTP/HTTPS routing, SSL/TLS termination, cookie-based session affinity, and a Web Application Firewall, but it is deployed within one virtual network and one region. Because it binds to a single regional frontend IP, it cannot direct traffic to the lowest-latency region among multiple Azure regions or automatically fail over to an entire region. Its URL-path-based routing is designed for distributing requests to backend pools inside the same region, not for multi-region geographic load balancing.
When this WOULD be correct
A company deploys a web application that requires URL-path-based routing (e.g., /images to one backend pool, /api to another) and SSL offloading at the gateway. The application is deployed in a single Azure region, and the requirement is to optimize HTTP-level routing and security, not global latency or regional failover.
- ✓
Azure Traffic Manager
Why this is correct
Azure Traffic Manager is a DNS-based traffic load balancer that operates globally. It supports the Performance routing method, which directs users to the region with the lowest latency, and automatically fails over to a healthy region if an endpoint becomes unavailable.
- ✗
Azure Front Door
Why it's wrong here
Azure Front Door is tempting as it provides global routing for web applications, offering both latency-based routing and automatic failover between regions. However, it operates at Layer 7 (HTTP/HTTPS), acting as a global entry point for web traffic. For directing users to the lowest latency region and ensuring seamless failover for *web servers* based on DNS resolution, Azure Traffic Manager is the more direct and appropriate solution. Front Door is typically chosen when additional features like Web Application Firewall (WAF), CDN integration, or TLS termination at the edge are also required.
When this WOULD be correct
A company deploys a web application that requires global HTTP/HTTPS load balancing with SSL termination, Web Application Firewall (WAF), URL path-based routing, and acceleration via the Microsoft global edge network. The application must also support session affinity and custom domain names.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-900 exam frequently reuses these exact scenarios with slightly different constraints.
✓Azure Traffic ManagerCorrect answer▾
Why this is correct
Azure Traffic Manager is a DNS-based traffic load balancer that operates globally. It supports the Performance routing method, which directs users to the region with the lowest latency, and automatically fails over to a healthy region if an endpoint becomes unavailable.
✗Azure Load BalancerWrong answer — click to see why▾
Why this is wrong here
Azure Load Balancer distributes traffic within a single region and does not provide global traffic routing based on latency or automatic failover across regions.
★ When this WOULD be the correct answer
A company deploys multiple VMs in the same Azure region behind a load balancer to distribute incoming traffic for high availability and scalability within that region.
Why candidates choose this
Candidates may confuse load balancing with global traffic management, assuming Load Balancer can handle cross-region routing and failover.
✗Azure Application GatewayWrong answer — click to see why▾
Why this is wrong here
Azure Application Gateway is a Layer 7 load balancer that routes traffic based on HTTP attributes (e.g., URL path, host headers) and provides SSL termination, but it does not perform global traffic routing based on latency or provide automatic failover across Azure regions.
★ When this WOULD be the correct answer
A company deploys a web application that requires URL-path-based routing (e.g., /images to one backend pool, /api to another) and SSL offloading at the gateway. The application is deployed in a single Azure region, and the requirement is to optimize HTTP-level routing and security, not global latency or regional failover.
Why candidates choose this
Candidates may confuse Application Gateway's load balancing capabilities with global traffic management, or assume that its Layer 7 features (like URL routing) can also handle multi-region latency-based routing and failover.
✗Azure Front DoorWrong answer — click to see why▾
Why this is wrong here
Azure Front Door is a global load balancer and application delivery controller that works at Layer 7 (HTTP/HTTPS), but it does not provide DNS-based traffic routing based on latency or automatic failover across regions without a DNS TTL delay. For latency-based routing and regional failover, Azure Traffic Manager (DNS-based) is the correct service.
★ When this WOULD be the correct answer
A company deploys a web application that requires global HTTP/HTTPS load balancing with SSL termination, Web Application Firewall (WAF), URL path-based routing, and acceleration via the Microsoft global edge network. The application must also support session affinity and custom domain names.
Why candidates choose this
Candidates may confuse Azure Front Door with Traffic Manager because both provide global routing and failover. They might think Front Door's global edge presence automatically handles latency-based routing, but Front Door is primarily an application delivery controller, not a DNS-based traffic manager.
Analysis generated from the official AZ-900blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
Learn chapter
Azure Regions and Geographies
Key term
User
A user is any person, system, or device that interacts with an IT service, resource, or identity system, typically authenticated through credentials and authorized to perform specific actions.
Key term
Azure Traffic Manager
Azure Traffic Manager is a DNS-based traffic load balancer that directs incoming web traffic to the most appropriate endpoint based on performance, priority, geographic location, or a weighted distribution method.
About these practice questions
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AZ-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-900 exam.