Which of the following best describes the concept of 'Defense in Depth'?

Answer options:

Using the strongest possible encryption for all data.

Relying on a perimeter firewall to block all threats.

Conducting annual penetration tests.

Implementing multiple layered controls (physical, technical, administrative) so that if one fails, others remain.

How to approach this question

Look for 'layers' or 'multiple' controls. The castle analogy: Moat + Wall + Guards + Keep.

Full Answer

D.Implementing multiple layered controls (physical, technical, administrative) so that if one fails, others remain.✓ Correct

Defense in Depth is a security strategy that employs a series of mechanisms to slow the advance of an attack. If one layer (e.g., firewall) is breached, others (e.g., endpoint protection, MFA) are there to stop the threat.

Common mistakes

Thinking one really strong control equals defense in depth.

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