Question 337 of 1,411

Describe the concepts of security, compliance, and identity →easyMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is implementing multiple layers of security controls to protect assets. This strategy, known as defense in depth, works by creating a series of overlapping defenses across network, endpoint, application, and data layers, so that if one control fails, another is already in place to block or slow an attacker. On the SC-900 exam, this concept tests your understanding of Microsoft’s layered security architecture—for example, how Microsoft Defender for Cloud provides workload protections while Microsoft Entra ID adds conditional access policies on top of identity verification. A common trap is choosing an option that describes a single strong control, like a firewall, instead of recognizing the need for redundancy across multiple layers. Remember the mnemonic “NEAD” for Network, Endpoint, Application, Data—each layer must have its own defense to truly achieve depth.

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. 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.

A security analyst is explaining the concept of 'defense in depth' to a new team member. Which of the following best describes the defense in depth strategy?

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.

Question 1easymultiple choice

Full question →

A
Using a single strong firewall to protect all network traffic
Why wrong: A single firewall is only one layer, not a multi-layered strategy. Defense in depth requires overlapping controls.
B
Implementing multiple layers of security controls to protect assets
This is correct. Defense in depth involves multiple independent layers such as physical security, network security, host security, and data encryption.
C
Relying on user training as the primary security measure
Why wrong: User training is important but not sufficient alone. It is one part of a layered approach, not the core definition of defense in depth.
D
Applying encryption only to data at rest
Why wrong: Encryption of data at rest is a single control. Defense in depth requires multiple layers including encryption in transit, access controls, and monitoring.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Implementing multiple layers of security controls to protect assets

Defense in depth is a cybersecurity strategy that employs multiple layers of security controls across different parts of an IT environment (network, endpoint, application, data) to ensure that if one layer fails, another layer is already in place to mitigate the threat. This approach is fundamental to Microsoft's security architecture, as seen in products like Microsoft Defender for Cloud, which integrates protections across workloads, and Azure Active Directory (now Microsoft Entra ID), which layers conditional access policies on top of identity verification. Option B correctly captures this layered, redundant approach rather than relying on a single point of defense.

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.

✗
Using a single strong firewall to protect all network traffic
Why it's wrong here
A single firewall is only one layer, not a multi-layered strategy. Defense in depth requires overlapping controls.
✓
Implementing multiple layers of security controls to protect assets
Why this is correct
This is correct. Defense in depth involves multiple independent layers such as physical security, network security, host security, and data encryption.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Relying on user training as the primary security measure
Why it's wrong here
User training is important but not sufficient alone. It is one part of a layered approach, not the core definition of defense in depth.
✗
Applying encryption only to data at rest
Why it's wrong here
Encryption of data at rest is a single control. Defense in depth requires multiple layers including encryption in transit, access controls, and monitoring.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse 'defense in depth' with 'layered security' but then incorrectly select a single-layer option like a strong firewall (A) because they think a robust perimeter is sufficient, failing to recognize that the strategy explicitly requires multiple independent and overlapping controls.

Detailed technical explanation

How to think about this question

Under the hood, defense in depth is modeled after the 'castle approach' with moats, walls, and inner keeps—each layer enforces a different security principle (e.g., network segmentation via VLANs and ACLs, host-based firewalls, application-level input validation, and data encryption at rest using AES-256). In a real-world Azure scenario, this might involve Azure Firewall at the network perimeter, Network Security Groups (NSGs) on subnets, Azure Policy for compliance, Microsoft Defender for Cloud for threat detection, and Azure Information Protection for data classification—all working in concert to provide redundancy and prevent a single vulnerability from leading to a full compromise.

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 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.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this SC-900 question test?

Describe the concepts of security, compliance, and identity — This question tests Describe the concepts of security, compliance, and identity — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Implementing multiple layers of security controls to protect assets — Defense in depth is a cybersecurity strategy that employs multiple layers of security controls across different parts of an IT environment (network, endpoint, application, data) to ensure that if one layer fails, another layer is already in place to mitigate the threat. This approach is fundamental to Microsoft's security architecture, as seen in products like Microsoft Defender for Cloud, which integrates protections across workloads, and Azure Active Directory (now Microsoft Entra ID), which layers conditional access policies on top of identity verification. Option B correctly captures this layered, redundant approach rather than relying on a single point of defense.

What should I do if I get this SC-900 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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?

Read the scenario before looking for a memorised answer.

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