Defense in depth strategy in Cybersecurity - Cheat Sheet & Quick Revision

Recall & Review

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What is the Defense in Depth strategy in cybersecurity?

Defense in Depth is a security approach that uses multiple layers of protection to defend information and systems. If one layer fails, others still protect the system.

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Name three common layers used in a Defense in Depth strategy.

Common layers include physical security (locks, guards), network security (firewalls, intrusion detection), and application security (passwords, encryption).

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Why is relying on a single security measure risky?

Because if that one security measure fails or is bypassed, the entire system becomes vulnerable. Defense in Depth reduces this risk by adding multiple layers.

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How does Defense in Depth relate to real-life security?

It’s like protecting your home with a fence, locked doors, alarm system, and neighborhood watch. Multiple protections make it harder for intruders to succeed.

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What role does user education play in Defense in Depth?

User education is a key layer because informed users can avoid risky actions like clicking suspicious links, helping to prevent security breaches.

What is the main goal of Defense in Depth?

A To focus only on physical security

B To rely on one strong firewall

C To remove all security layers for speed

D To use multiple security layers to protect systems

Defense in Depth means using several layers of security so if one fails, others still protect the system.

Which of the following is NOT a typical layer in Defense in Depth?

A Ignoring user training

B Network security

C Application security

D Physical security

User training is an important layer; ignoring it weakens security.

Why is Defense in Depth compared to home security?

A Because both use multiple protections like locks and alarms

B Because homes don’t need security

C Because it uses only one lock

D Because it ignores physical barriers

Both use several layers to make it harder for intruders to get in.

What happens if you rely on only one security layer?

A Security is faster and better

B The system is very vulnerable if that layer fails

C The system is fully protected

D No need for backups

One layer failing means no other protections remain, increasing risk.

Which of these is a benefit of Defense in Depth?

A It makes systems slower without benefits

B It removes the need for passwords

C Multiple layers reduce the chance of a breach

D It focuses only on software updates

Multiple layers help catch threats even if one layer is bypassed.

Explain the concept of Defense in Depth and why it is important in cybersecurity.

Think about how having many protections helps keep systems safe.

Describe real-life examples that illustrate the Defense in Depth strategy.

Consider how you protect your home or valuables.