SC-900 Practice Question: Describe the concepts of security, compliance, and identity
This SC-900 practice question tests your understanding of describe the concepts of security, compliance, and identity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: defense in depth uses multiple, overlapping security controls.. 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 implements multiple layers of security controls, including firewalls, antivirus software, access controls, and security awareness training. Which security concept does this approach best represent?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Why wrong: Zero Trust is a security model that assumes no implicit trust and requires continuous verification, not specifically a layered defense approach.
B
Defense in depth
Defense in depth uses multiple overlapping layers of security controls (e.g., network, endpoint, access, awareness) to protect assets, making it the correct concept.
C
Shared responsibility
Why wrong: Shared responsibility defines which security tasks are handled by the cloud provider versus the customer, not the use of multiple layers.
D
Least privilege
Why wrong: Least privilege is a principle that limits user access rights to the minimum necessary, not a multi-layered security architecture.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Defense in depth
Defense in depth is the correct concept because it involves layering multiple independent security controls—such as firewalls, antivirus, access controls, and training—so that if one layer fails, others continue to protect the asset. This approach reduces the likelihood of a single point of failure and is a foundational strategy in cybersecurity architecture.
Key principle: Defense in depth uses multiple, overlapping security controls.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Zero Trust
Why it's wrong here
Zero Trust is a security model that assumes no implicit trust and requires continuous verification, not specifically a layered defense approach.
✓
Defense in depth
Why this is correct
Defense in depth uses multiple overlapping layers of security controls (e.g., network, endpoint, access, awareness) to protect assets, making it the correct concept.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Defense in depth uses multiple, overlapping security controls.
✗
Shared responsibility
Why it's wrong here
Shared responsibility defines which security tasks are handled by the cloud provider versus the customer, not the use of multiple layers.
✗
Least privilege
Why it's wrong here
Least privilege is a principle that limits user access rights to the minimum necessary, not a multi-layered security architecture.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the layered approach of defense in depth with the Zero Trust model, but Zero Trust is specifically about eliminating implicit trust and enforcing per-request verification, not just adding multiple security layers.
Detailed technical explanation
How to think about this question
Defense in depth employs overlapping controls across administrative, technical, and physical domains—for example, combining network segmentation (VLANs, ACLs), host-based intrusion prevention (HIPS), and application whitelisting. In a real-world scenario, an attacker bypassing a perimeter firewall would still face internal network segmentation, endpoint detection and response (EDR), and user behavior analytics, ensuring no single vulnerability compromises the entire system.
KKey Concepts to Remember
Defense in depth uses multiple, overlapping security controls.
It aims to create a robust security posture by not relying on a single point of failure.
Layers can include physical, technical, and administrative controls.
Examples include firewalls, antivirus, access controls, and security awareness.
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
Defense in depth uses multiple, overlapping security controls.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-900 question in full detail.
Review defense in depth uses multiple, overlapping security controls., then practise related SC-900 questions on the same topic to reinforce the concept.
Describe the concepts of security, compliance, and identity — This question tests Describe the concepts of security, compliance, and identity — Defense in depth uses multiple, overlapping security controls..
What is the correct answer to this question?
The correct answer is: Defense in depth — Defense in depth is the correct concept because it involves layering multiple independent security controls—such as firewalls, antivirus, access controls, and training—so that if one layer fails, others continue to protect the asset. This approach reduces the likelihood of a single point of failure and is a foundational strategy in cybersecurity architecture.
What should I do if I get this SC-900 question wrong?
Review defense in depth uses multiple, overlapping security controls., then practise related SC-900 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Defense in depth uses multiple, overlapping security controls.
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