CAS-004 Security Architecture Practice Question
A company is implementing a defense-in-depth strategy for its web application. Which THREE of the following are layers that should be included? (Select THREE.)
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
✓
Application security controls (WAF, input validation)
Defense in depth uses multiple security layers: network controls, application security, and data protection are key layers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Application security controls (WAF, input validation)
Why this is correct
Application layer controls protect against web attacks.
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Single sign-on (SSO) without MFA
Why it's wrong here
SSO alone is not a defense layer; MFA is needed.
- ✓
Data encryption at rest and in transit
Why this is correct
Data layer protection is crucial.
- ✓
Network firewall and IDS/IPS
Why this is correct
Network layer is a standard defense layer.
- ✗
Physical security of the data center
Why it's wrong here
While important, physical security is typically not considered an application defense layer.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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