The answer is SQL Server Always On availability groups on Azure VMs. This service provides automatic failover and load balancing for SQL Server databases by replicating data across multiple Azure VMs, using a listener endpoint to direct read/write traffic and a Windows Server Failover Cluster to monitor health and trigger failover without manual intervention. On the AZ-900 exam, this question tests your understanding of native high availability solutions for SQL Server in Azure, often appearing as a scenario where you must choose between PaaS options like Azure SQL Database and IaaS options like Always On availability groups. A common trap is confusing this with Azure SQL Database’s built-in high availability, which is managed by the platform, whereas Always On requires you to configure the VMs and clustering yourself. Memory tip: think “Always On = Always your VMs, Always your cluster” to remember it’s an IaaS-level solution for automatic failover and load balancing.
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.
Which Azure service provides automatic failover and load balancing for SQL Server databases across multiple Azure VMs?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
SQL Server Always On availability groups on Azure VMs
B is correct because SQL Server Always On availability groups on Azure VMs provide native high availability and disaster recovery for SQL Server, including automatic failover between replicas and built-in read/write load balancing via listener endpoints. This service operates at the SQL Server instance level, supporting multiple Azure VMs in an availability set or availability zone, and uses Windows Server Failover Clustering (WSFC) for health monitoring and automatic failover.
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 SQL Database with active geo-replication
Why it's wrong here
Active geo-replication is for Azure SQL Database PaaS service — the question asks about SQL Server on Azure VMs.
✓
SQL Server Always On availability groups on Azure VMs
Why this is correct
Always On availability groups provide automatic failover and load balancing for SQL Server databases on Azure VMs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Load Balancer
Why it's wrong here
Load Balancer distributes traffic but doesn't provide SQL Server database-level failover.
✗
Azure Site Recovery
Why it's wrong here
Site Recovery is for disaster recovery (VM replication between regions) — not SQL Server availability group failover.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Azure SQL Database's built-in high availability (which is fully managed and includes automatic failover) with the IaaS-based SQL Server on Azure VMs, where you must configure Always On availability groups yourself to achieve similar automatic failover and load balancing.
Detailed technical explanation
How to think about this question
SQL Server Always On availability groups use a primary replica for read-write transactions and up to eight secondary replicas for read-only workloads, with automatic failover requiring at least two synchronous replicas and a quorum witness (e.g., a file share or Azure cloud witness). The availability group listener uses a DNS name and a virtual IP address, which Azure Load Balancer or a distributed network name (DNN) can support, but the failover logic is driven by WSFC and SQL Server, not by Azure Load Balancer alone. In a real-world scenario, a multi-region deployment might combine Always On availability groups with Azure Traffic Manager for global load balancing, but the question specifically asks about automatic failover and load balancing across multiple Azure VMs, which is the core function of Always On availability groups.
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: SQL Server Always On availability groups on Azure VMs — B is correct because SQL Server Always On availability groups on Azure VMs provide native high availability and disaster recovery for SQL Server, including automatic failover between replicas and built-in read/write load balancing via listener endpoints. This service operates at the SQL Server instance level, supporting multiple Azure VMs in an availability set or availability zone, and uses Windows Server Failover Clustering (WSFC) for health monitoring and automatic failover.
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.
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