The correct answer is a layered security approach where multiple defenses protect assets, because defense in depth in cloud security is fundamentally about creating overlapping, independent controls across every layer of the IT stack—network, compute, storage, application, and data—so that if one layer fails, others stand ready to block or contain the threat. On the Microsoft Azure Fundamentals AZ-900 exam, this concept tests your understanding of Azure’s core security philosophy, often appearing in scenario-based questions where you must identify which combination of tools—like Azure Firewall, NSGs, Azure Policy, and Microsoft Defender for Cloud—provides the most resilient protection. A common trap is confusing defense in depth with a single strong control, such as a firewall alone; remember that the exam emphasizes redundancy over perfection. Memory tip: think of an onion—each layer adds another barrier, and peeling one away still leaves the core protected.
AZ-900 Describe cloud concepts Practice Question
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A layered security approach where multiple defenses protect assets
Defense in depth is a layered security strategy that uses multiple, independent security controls across different layers of the IT stack (network, compute, storage, application, data) to protect assets. If one layer is breached, additional layers are in place to prevent or limit further compromise. This approach is fundamental to Azure's security architecture, where tools like Azure Firewall, Network Security Groups (NSGs), Azure Policy, and Azure Defender work together to provide overlapping protections.
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.
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Using a very strong single password for all Azure accounts
Why it's wrong here
A single password is a single point of failure; defense in depth uses multiple overlapping layers.
✓
A layered security approach where multiple defenses protect assets
Why this is correct
Defense in depth uses multiple overlapping security layers so breaching one doesn't expose the whole system.
Related concept
Read the scenario before looking for a memorised answer.
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Storing data in multiple geographic locations for backup
Why it's wrong here
Geographic data replication is for availability; defense in depth is about layered security controls.
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Using the most advanced encryption for all Azure data
Why it's wrong here
Encryption is one layer of defense in depth, not the entirety of the concept.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse defense in depth with a single strong security measure (like encryption or strong passwords) or with unrelated concepts like geographic redundancy, rather than recognizing it as a layered, multi-control strategy.
Detailed technical explanation
How to think about this question
Under the hood, defense in depth in Azure involves overlapping controls such as Azure Policy for governance, Azure RBAC for identity-based access, NSGs for network traffic filtering, Azure DDoS Protection for volumetric attacks, and Azure Key Vault for secret management. A real-world scenario: even if an attacker exploits a vulnerability in a web application (Layer 7), NSGs can block lateral movement to the database subnet, and Azure SQL's Advanced Threat Protection can detect anomalous queries, preventing data exfiltration.
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 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: A layered security approach where multiple defenses protect assets — Defense in depth is a layered security strategy that uses multiple, independent security controls across different layers of the IT stack (network, compute, storage, application, data) to protect assets. If one layer is breached, additional layers are in place to prevent or limit further compromise. This approach is fundamental to Azure's security architecture, where tools like Azure Firewall, Network Security Groups (NSGs), Azure Policy, and Azure Defender work together to provide overlapping protections.
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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