This CC practice question tests your understanding of security principles. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
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?
Defense in depth
Defense in depth uses multiple layers of security controls, both technical and administrative.
Security through obscurity
Why wrong: Security through obscurity relies on secrecy, which is not the case here.
Least privilege
Why wrong: Least privilege is about access rights, not layered controls.
Separation of duties
Why wrong: Separation of duties divides tasks, not layers.
Answer choices
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 uses multiple layered controls. The combination of technical and administrative controls is key.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
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
Defense in depth uses multiple layers of security controls, both technical and administrative.
Related concept
Authentication checks who the user is.
Security through obscurity
Why it's wrong here
Security through obscurity relies on secrecy, which is not the case here.
Least privilege
Why it's wrong here
Least privilege is about access rights, not layered controls.
Separation of duties
Why it's wrong here
Separation of duties divides tasks, not layers.
Common exam traps
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CC questions on access control and AAA configuration.
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FAQ
Security Principles — This question tests Security Principles — Authentication checks who the user is..
The correct answer is: Defense in depth — Defense in depth uses multiple layered controls. The combination of technical and administrative controls is key.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CC questions on access control and AAA configuration.
Authentication checks who the user is.
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Last reviewed: Jun 24, 2026
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