This AZ-900 practice question tests your understanding of describe cloud concepts. 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 deploys their application across multiple availability zones in an Azure region. This is done to improve which aspect of the application?
Scalability
Why wrong: Scalability is about handling increased load, not fault tolerance.
Elasticity
Why wrong: Elasticity is about automatic scaling based on demand.
High availability
Availability zones improve uptime by isolating failures.
Cost efficiency
Why wrong: Using multiple zones may increase cost, it is not primarily about cost efficiency.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
High availability
Deploying an application across multiple availability zones within an Azure region ensures that if one zone experiences an outage (e.g., due to power failure or network disruption), the application can continue serving traffic from the remaining zones. This architecture directly improves high availability by eliminating a single point of failure at the datacenter level, typically achieving a service-level agreement (SLA) of 99.99% for virtual machines when using two or more instances across zones.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Scalability
Why it's wrong here
Scalability is about handling increased load, not fault tolerance.
Elasticity
Why it's wrong here
Elasticity is about automatic scaling based on demand.
High availability
Why this is correct
Availability zones improve uptime by isolating failures.
Related concept
Read the scenario before looking for a memorised answer.
Cost efficiency
Why it's wrong here
Using multiple zones may increase cost, it is not primarily about cost efficiency.
Common exam traps
The trap here is that candidates confuse high availability with scalability or elasticity, mistakenly thinking that distributing across zones helps handle more users or automatically adjust capacity, when in fact it is solely about maintaining uptime during failures.
Detailed technical explanation
Availability zones are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. When you deploy VMs across zones, Azure ensures they are placed in different fault domains and update domains, so a single hardware failure or planned maintenance event does not affect all instances simultaneously. In a real-world scenario, a financial trading application using Azure SQL Database with zone-redundant configuration can survive a full zone outage without data loss, as synchronous replication between zones maintains consistency.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Describe cloud concepts — study guide chapter
Learn the concepts, then practise the questions
Describe cloud concepts practice questions
Targeted practice on this topic area only
All AZ-900 questions
1,031 questions across all exam domains
Microsoft Azure Fundamentals AZ-900 study guide
Full concept coverage aligned to exam objectives
AZ-900 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise AZ-900 questions linked to Describe cloud concepts.
Practise AZ-900 questions linked to Describe Azure architecture and services.
Practise AZ-900 questions linked to Describe Azure management and governance.
Practise AZ-900 questions linked to AZ-900 Azure services.
Practise AZ-900 questions linked to AZ-900 pricing and support.
Practise AZ-900 questions linked to AZ-900 security and compliance.
Practise AZ-900 questions linked to AZ-900 governance.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Describe cloud concepts — This question tests Describe cloud concepts — Read the scenario before looking for a memorised answer..
The correct answer is: High availability — Deploying an application across multiple availability zones within an Azure region ensures that if one zone experiences an outage (e.g., due to power failure or network disruption), the application can continue serving traffic from the remaining zones. This architecture directly improves high availability by eliminating a single point of failure at the datacenter level, typically achieving a service-level agreement (SLA) of 99.99% for virtual machines when using two or more instances across zones.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 →
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.
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.