The answer is Azure Load Balancer. This solution operates at Layer 4 of the OSI model, using a hash of the source IP and port to distribute TCP or UDP traffic evenly across backend VMs, which prevents any single virtual machine from being overwhelmed. For the Microsoft Azure Fundamentals AZ-900 exam, this scenario tests your understanding of the core load balancing services: Azure Load Balancer handles regional, network-level distribution, while Application Gateway works at Layer 7 with HTTP routing, and Traffic Manager manages global DNS-based traffic. A common trap is confusing these services when the question specifies “even distribution across VMs within one region”—that is always the job of Azure Load Balancer. Remember the memory tip: “Layer 4 for even floor, Layer 7 for web door, Traffic Manager for global score.”
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 runs a web application on Azure VMs. They want to distribute incoming traffic evenly across multiple VMs to ensure no single VM is overwhelmed. 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 (Option D) operates at Layer 4 (TCP/UDP) and distributes incoming traffic across a set of backend VMs based on a hash of the source IP and port, ensuring even distribution and high availability. It is the correct choice for balancing traffic within a single Azure region across multiple VMs to prevent any single VM from being overwhelmed.
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 Application Gateway
Why it's wrong here
Application Gateway is a layer 7 load balancer with features like URL routing and SSL termination, not just layer 4 distribution.
✗
Azure Front Door
Why it's wrong here
Front Door is a global load balancer for web applications at the edge.
✗
Azure Traffic Manager
Why it's wrong here
Traffic Manager is a DNS-based load balancer for global traffic routing.
✓
Azure Load Balancer
Why this is correct
Load Balancer distributes raw network traffic across VMs at the transport layer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Load Balancer (Layer 4) with Azure Application Gateway (Layer 7) or Azure Traffic Manager (DNS-level), thinking any 'load balancing' solution works the same, but the question specifically requires even distribution of traffic across VMs within a single region, which is the core function of Azure Load Balancer.
Detailed technical explanation
How to think about this question
Azure Load Balancer uses a 5-tuple hash (source IP, source port, destination IP, destination port, protocol) to map traffic to backend VMs, ensuring session affinity is not maintained by default unless configured with source IP affinity. In a real-world scenario, if a company uses Availability Sets or Availability Zones, Azure Load Balancer automatically distributes traffic only to healthy VMs by performing health probes (e.g., TCP or HTTP probes) every 5 seconds, with a configurable threshold of 2 consecutive failures to mark a VM as unhealthy.
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 (Option D) operates at Layer 4 (TCP/UDP) and distributes incoming traffic across a set of backend VMs based on a hash of the source IP and port, ensuring even distribution and high availability. It is the correct choice for balancing traffic within a single Azure region across multiple VMs to prevent any single VM from being overwhelmed.
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 →
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.