The answer is Azure Managed Instance for Apache Cassandra, the fully managed NoSQL database service that provides automatic scaling and multi-region writes. This service is correct because it handles the operational overhead of running Apache Cassandra clusters, including automated node provisioning, patching, and health monitoring, while natively supporting the Cassandra Query Language (CQL) API. Its automatic scaling adjusts cluster capacity based on workload demands, and its multi-region replication enables low-latency writes across geographically distributed data centers. On the AZ-900 exam, this question tests your understanding of Azure’s managed database offerings and their key differentiators—specifically, that Azure Managed Instance for Apache Cassandra is the only service combining Cassandra API compatibility with built-in scaling and global write support. A common trap is confusing it with Azure Cosmos DB for Apache Cassandra, which uses a different underlying architecture; remember that “Managed Instance” means you get the real Cassandra engine with full control over cluster configuration. For a quick memory tip, think “Cassandra Managed = Cluster Automated + Multi-Region Writes.”
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 fully managed Apache Cassandra NoSQL database with automatic scaling and multi-region writes?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Managed Instance for Apache Cassandra
Azure Managed Instance for Apache Cassandra is the correct answer because it is a fully managed service that automates deployment, scaling, and operations of Apache Cassandra clusters, including support for multi-region writes. It provides native Cassandra API compatibility, automatic scaling, and managed multi-region replication, which aligns precisely with the question's requirements.
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 Cosmos DB for Apache Cassandra
Why it's wrong here
Cosmos DB for Cassandra provides Cassandra API compatibility; Azure Managed Instance for Cassandra provides native open-source Cassandra.
✓
Azure Managed Instance for Apache Cassandra
Why this is correct
Azure Managed Instance for Apache Cassandra provides fully managed native Cassandra with multi-region write support.
Related concept
Read the scenario before looking for a memorised answer.
HDInsight supports various big data frameworks but isn't the Cassandra-specific managed service.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Cosmos DB for Apache Cassandra (a compatibility layer) with a true managed Cassandra instance, assuming the 'for Apache Cassandra' label means it runs the actual Cassandra engine, when in fact it is a Cosmos DB API that lacks native Cassandra internals like compaction strategies and repair operations.
Detailed technical explanation
How to think about this question
Under the hood, Azure Managed Instance for Apache Cassandra uses the open-source Apache Cassandra codebase with Azure-specific automation for provisioning, patching, and scaling via a control plane that manages node discovery, replication factor, and consistency levels. A real-world scenario is a global e-commerce platform requiring low-latency writes across multiple regions with tunable consistency (e.g., LOCAL_QUORUM) to balance performance and data integrity, which this service handles natively without custom replication logic.
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
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 Managed Instance for Apache Cassandra — Azure Managed Instance for Apache Cassandra is the correct answer because it is a fully managed service that automates deployment, scaling, and operations of Apache Cassandra clusters, including support for multi-region writes. It provides native Cassandra API compatibility, automatic scaling, and managed multi-region replication, which aligns precisely with the question's requirements.
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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Question Discussion
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