ISC2 CC Access Controls Concepts Practice Question
Which principle ensures that users are granted only the minimum permissions necessary to perform their job functions?
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
✓
Least privilege
Least privilege limits permissions to the minimum required, reducing the blast radius of a compromise.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Defense in depth
Why it's wrong here
Defense in depth uses multiple overlapping controls.
- ✓
Least privilege
Why this is correct
Least privilege grants only the minimum permissions needed.
- ✗
Separation of duties
Why it's wrong here
Separation of duties prevents a single person from completing a high-risk action alone.
- ✗
Need-to-know
Why it's wrong here
Need-to-know restricts access to specific data, not overall permissions.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
Go deeper
Related to this question
Learn chapter
Access Control Fundamentals
Key term
Access control
Access control is the security practice of determining who or what is allowed to view, use, or enter a resource, and under what conditions.
Key term
RADIUS
RADIUS is a network protocol that provides centralized authentication, authorization, and accounting management for users who connect and use a network service.
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JA
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.