The answer is Azure Load Balancer. This is correct because Azure Load Balancer operates at Layer 4 of the OSI model, routing TCP and UDP traffic based on IP address and port, making it ideal for distributing incoming traffic evenly across healthy VM instances in a backend pool without inspecting application-layer data. By deploying VMs across multiple availability zones within a single region, the Load Balancer ensures high availability and even load distribution even if an entire zone fails. On the AZ-900 exam, this question tests your understanding of which service handles regional, zone-resilient traffic distribution versus global or application-layer solutions like Traffic Manager or Application Gateway. A common trap is choosing Traffic Manager for regional load balancing, but remember: Traffic Manager works at the DNS level for global traffic, while Azure Load Balancer is the correct choice for distributing traffic evenly across VMs within a single region. Memory tip: "Layer 4 for regional, Layer 7 for app-level, DNS for global."
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 company has an application running on Azure VMs across multiple availability zones to protect against data center failures. They need to distribute incoming traffic evenly across all VMs in a single region. Which Azure load balancing solution should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Load Balancer
Azure Load Balancer operates at Layer 4 (TCP/UDP) and distributes incoming traffic across healthy VM instances in the backend pool. By deploying VMs across multiple availability zones within a single region, the Load Balancer can route traffic evenly to all zone-resilient VMs, providing high availability and load distribution without application-layer inspection.
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 Load Balancer
Why this is correct
Load Balancer distributes inbound traffic to healthy VMs in the same region, supporting zone-redundant configurations.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Application Gateway
Why it's wrong here
Application Gateway is a Layer 7 load balancer for HTTP traffic, not needed for basic traffic distribution.
✗
Azure Traffic Manager
Why it's wrong here
Traffic Manager is DNS-based for routing traffic to different regions, not for distributing traffic across VMs within a region.
✗
Azure Front Door
Why it's wrong here
Front Door is a global Layer 7 load balancer with acceleration and WAF, not needed for regional traffic distribution.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Azure Load Balancer (Layer 4, regional) with Azure Traffic Manager (DNS-based, global) or Azure Front Door (Layer 7, global), leading candidates to pick a global solution when the requirement is for regional traffic distribution.
Detailed technical explanation
How to think about this question
Azure Load Balancer uses a five-tuple hash (source IP, source port, destination IP, destination port, protocol) to map flows to backend VMs, ensuring session persistence for TCP/UDP traffic. It supports health probes (HTTP, TCP, or HTTPS) to monitor backend VM health and automatically removes unhealthy instances from the rotation. In a multi-zone deployment, the Load Balancer is zone-redundant by default, meaning it can survive zone failures without manual intervention.
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.
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 Load Balancer — Azure Load Balancer operates at Layer 4 (TCP/UDP) and distributes incoming traffic across healthy VM instances in the backend pool. By deploying VMs across multiple availability zones within a single region, the Load Balancer can route traffic evenly to all zone-resilient VMs, providing high availability and load distribution without application-layer inspection.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company deploys a web application on Azure Virtual Machines across multiple availability zones within a single region. They need to distribute incoming network traffic across these VM instances to ensure high availability. Which Azure service should they use?
easy
✓ A.Azure Load Balancer
B.Azure Application Gateway
C.Azure Traffic Manager
D.Azure Front Door
Why A: Azure Load Balancer is the correct choice because it operates at Layer 4 (TCP/UDP) and distributes incoming traffic across healthy virtual machines within a single region, including across availability zones. It provides high availability by automatically routing traffic only to healthy VM instances based on health probes, and it supports both public and internal load balancing scenarios.
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.