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ISC2 CC Practice Question: Which THREE of the following are examples of…
Which THREE of the following are examples of implementing defense in depth? (Select THREE.)
⚠ Common exam trap
ISC2 often tests the concept that defense in depth requires multiple independent layers of security, so candidates mistakenly select options that improve convenience (like SSO) or violate security principles (like allowing all traffic) instead of recognizing that each correct option adds a distinct security control at a different layer.
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
✓
Using a firewall to filter traffic
A firewall is a fundamental component of defense in depth, providing network-level traffic filtering based on rules. It acts as a first line of defense by blocking unauthorized access and malicious traffic, thereby reducing the attack surface. This layered security approach ensures that even if other controls fail, the firewall can still prevent or mitigate threats.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enabling single sign-on for all applications
Why it's wrong here
SSO reduces authentication layers.
- ✓
Using a firewall to filter traffic
Why this is correct
Correct. Firewall is a layer.
- ✗
Allowing all traffic by default
Why it's wrong here
Default allow removes a layer.
- ✓
Implementing access control lists
Why this is correct
Correct. ACLs provide granular control.
- ✓
Encrypting data at rest
Why this is correct
Correct. Encryption adds a layer.
Visual reference
Go deeper
Related to this question
Learn chapter
Introduction to Security Principles
Key term
Firewall
A firewall is a network security system that monitors and controls incoming and outgoing traffic based on predetermined security rules to protect trusted internal networks from untrusted external networks.
Key term
Defense in depth
Defense in depth is a cybersecurity strategy that uses multiple layers of security controls to protect information and systems, so if one layer fails, another layer is already in place to stop the attack.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CC practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CC exam.