- A
Azure Traffic Manager
Correct. Azure Traffic Manager uses DNS to direct client traffic to the closest or healthiest regional endpoint based on the performance routing method. It automatically fails over in case of region failure, and requires no application changes.
- B
Azure Load Balancer
Why wrong: Incorrect. Azure Load Balancer distributes incoming traffic within a single Azure region, not across multiple regions. It does not provide latency-based routing across regions.
- C
Azure Application Gateway
Why wrong: Incorrect. Azure Application Gateway is a regional web traffic load balancer that operates at the application layer (HTTP/HTTPS). It does not offer cross-region latency-based routing or automatic failover across regions.
- D
Azure Front Door
Why wrong: Incorrect. Azure Front Door provides global load balancing and application acceleration, but it is more complex than required. For a simple DNS-based performance routing and failover requirement without any code changes, Azure Traffic Manager is the simpler and correct solution.
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 company runs its website on Azure virtual machines in two different Azure regions: West US and East US. The company wants to distribute incoming web traffic to the region that provides the lowest latency for each user. Additionally, if one region becomes unavailable, all traffic should automatically fail over to the healthy region. The solution must not require any changes to the web application code. Which Azure service should the company use?
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 incoming web traffic to the region with the lowest latency based on the user's DNS resolver location. It supports automatic failover by routing traffic to the next healthy endpoint if a region becomes unavailable, and it requires no changes to the web application code because it operates at the DNS level.
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 this is correct
Correct. Azure Traffic Manager uses DNS to direct client traffic to the closest or healthiest regional endpoint based on the performance routing method. It automatically fails over in case of region failure, and requires no application changes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure Load Balancer
Why it's wrong here
Incorrect. Azure Load Balancer distributes incoming traffic within a single Azure region, not across multiple regions. It does not provide latency-based routing across regions.
- ✗
Azure Application Gateway
Why it's wrong here
Incorrect. Azure Application Gateway is a regional web traffic load balancer that operates at the application layer (HTTP/HTTPS). It does not offer cross-region latency-based routing or automatic failover across regions.
- ✗
Azure Front Door
Why it's wrong here
Incorrect. Azure Front Door provides global load balancing and application acceleration, but it is more complex than required. For a simple DNS-based performance routing and failover requirement without any code changes, Azure Traffic Manager is the simpler and correct solution.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Traffic Manager with Azure Front Door, but Front Door requires HTTPS and operates at the application layer with additional features like caching and WAF, whereas Traffic Manager is a simpler DNS-based solution that meets the requirement of no code changes and works with any HTTP/HTTPS or TCP traffic.
Detailed technical explanation
How to think about this question
Azure Traffic Manager uses DNS responses to direct traffic based on the traffic-routing method (e.g., Performance, Priority, Geographic). In Performance mode, it uses the client's DNS resolver IP to determine the closest endpoint by measuring latency via a global network of probes, and it supports automatic failover by monitoring endpoint health via HTTP/HTTPS/TCP probes. A subtle behavior is that DNS caching by clients or ISPs can delay failover, so Traffic Manager uses short TTLs (e.g., 30 seconds) to minimize this, but it is not instantaneous like a load balancer at the network layer.
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.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this AZ-900 question test?
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 Traffic Manager — Azure Traffic Manager is a DNS-based traffic load balancer that directs incoming web traffic to the region with the lowest latency based on the user's DNS resolver location. It supports automatic failover by routing traffic to the next healthy endpoint if a region becomes unavailable, and it requires no changes to the web application code because it operates at the DNS level.
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.
About these practice questions
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Last reviewed: Jun 11, 2026
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.
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