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.
What is a key advantage of using Azure Availability Zones over a single data center deployment?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Protection against single data center failures with a 99.99% SLA
Azure Availability Zones are physically separate data centers within an Azure region, each with independent power, cooling, and networking. By deploying resources across multiple zones, you protect your application from a single data center failure, and Azure guarantees 99.99% VM uptime SLA when VMs are deployed across two or more zones. This is a key advantage over a single data center deployment, which would have no such cross-zone redundancy.
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.
✗
Resources deployed across Availability Zones are cheaper than single-zone deployment
Why it's wrong here
AZ deployment doesn't reduce cost; zone-redundant resources may cost slightly more for the zone-redundant SKUs.
✓
Protection against single data center failures with a 99.99% SLA
Why this is correct
AZ deployment provides 99.99% SLA and protects against any single data center failure within the region.
Related concept
Read the scenario before looking for a memorised answer.
✗
Resources are automatically replicated to a secondary Azure region
Why it's wrong here
AZs are within one region; cross-region replication is separate geo-redundancy, not provided by AZs alone.
✗
Availability Zones eliminate the need for load balancing
Why it's wrong here
Zone-redundant deployments still benefit from load balancing to distribute traffic across zones.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Availability Zones (within a region) with Azure Regions (geographically separated), leading them to incorrectly select Option C about automatic cross-region replication.
Detailed technical explanation
How to think about this question
Under the hood, each Availability Zone is a unique physical location with its own fault domain and update domain, ensuring that a failure in one zone does not cascade to others. For VMs, you must explicitly configure an availability set or use a virtual machine scale set with zone-redundant deployment to achieve the 99.99% SLA; simply placing VMs in different zones without a load balancer does not automatically distribute traffic. In a real-world scenario, a retail application using Azure SQL Database with zone-redundant configuration can survive a zone-wide outage without manual failover, but the application must also be stateless and fronted by a load balancer to reroute traffic.
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 cloud concepts — This question tests Describe cloud concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Protection against single data center failures with a 99.99% SLA — Azure Availability Zones are physically separate data centers within an Azure region, each with independent power, cooling, and networking. By deploying resources across multiple zones, you protect your application from a single data center failure, and Azure guarantees 99.99% VM uptime SLA when VMs are deployed across two or more zones. This is a key advantage over a single data center deployment, which would have no such cross-zone redundancy.
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.