The answer is defense in depth, the security principle of layering multiple independent controls so that if one fails, others still provide protection. This is correct because the scenario stacks a web application firewall (application-layer filtering), vulnerability scanning (proactive detection), and strict access controls (preventive policy) across different layers—network, host, and application—creating redundancy that no single control can guarantee. On the ISC2 Certified in Cybersecurity CC exam, this concept tests your understanding that security is not a single solution but a strategy of overlapping defenses; a common trap is confusing defense in depth with a single control like a firewall or encryption. Remember the mnemonic “Layers, not saviors”—no one tool saves you, but a stack of them does.
ISC2 CC Security Principles Practice Question
This CC practice question tests your understanding of security principles. 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 company deploys a web application firewall (WAF), performs regular vulnerability scans, and implements strict access controls. Which security principle is being applied?
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 security principle of layering multiple independent security controls so that if one fails, others still provide protection. The question describes three distinct layers: a WAF (application-layer filtering), vulnerability scanning (proactive detection), and strict access controls (preventive policy). This stacking of different types of controls across the network, host, and application layers is the textbook definition of defense in depth.
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.
✓
Defense in depth
Why this is correct
Multiple layers of security controls exemplify defense in depth.
Related concept
Read the scenario before looking for a memorised answer.
✗
Accountability
Why it's wrong here
Accountability ensures actions can be traced to an individual, not the deployment of multiple controls.
✗
Risk management
Why it's wrong here
Risk management involves identifying and mitigating risks, but the described actions specifically implement layered defenses.
✗
Least privilege
Why it's wrong here
Least privilege focuses on user permissions, not multiple controls.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests defense in depth by listing multiple security tools and expecting candidates to recognize the layering concept, but the trap here is that candidates confuse 'defense in depth' with 'least privilege' because both involve multiple controls, when in fact least privilege is just one layer within a defense-in-depth strategy.
Detailed technical explanation
How to think about this question
Under the hood, defense in depth relies on the principle that no single control is infallible — a WAF can be bypassed by a zero-day exploit, vulnerability scans may miss logic flaws, and access controls can be misconfigured. In practice, a real-world scenario might involve a web application protected by a WAF (e.g., ModSecurity with OWASP CRS), regular Nessus scans for missing patches, and IAM policies enforcing MFA and role-based access — each layer compensates for the others' blind spots. This approach is formalized in frameworks like NIST SP 800-53, which mandates overlapping security controls across multiple domains.
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 security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CC question in full detail.
Security Principles — This question tests Security Principles — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Defense in depth — Defense in depth is the security principle of layering multiple independent security controls so that if one fails, others still provide protection. The question describes three distinct layers: a WAF (application-layer filtering), vulnerability scanning (proactive detection), and strict access controls (preventive policy). This stacking of different types of controls across the network, host, and application layers is the textbook definition of defense in depth.
What should I do if I get this CC 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.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An organization deploys firewalls at the network perimeter, antivirus on endpoints, and encryption for data at rest. This approach best exemplifies which security principle?
medium
A.Separation of duties
B.Diversity of defense
C.Least privilege
✓ D.Defense in depth
Why D: Correct: A - Defense in depth. Defense in depth uses multiple, overlapping security controls. Option B is wrong because least privilege limits access. Option C is wrong because separation of duties divides responsibilities. Option D is wrong because diversity of defense is not a standard principle.
Variation 2. An organization is designing a security architecture for a cloud-based application. They implement firewalls, intrusion detection systems, and encryption, and also conduct regular security awareness training. This approach demonstrates which security principle?
hard
✓ A.Defense in depth
B.Security through obscurity
C.Least privilege
D.Separation of duties
Why A: Defense in depth uses multiple layered controls. The combination of technical and administrative controls is key.
Variation 3. An organization wants to implement defense in depth for its web application. Which combination of controls best illustrates this principle?
medium
A.A strict perimeter firewall without internal controls.
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Question Discussion
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