Quick Answer
Authentication is the correct choice because it is the security control specifically designed to verify identity before granting access to a system. While authorization determines what an authenticated user can do, and accounting tracks their actions, authentication is the foundational step that confirms a user is who they claim to be—often through passwords, biometrics, or multi-factor methods. On the ISC2 Certified in Cybersecurity CC exam, this distinction is frequently tested in scenario-based questions that mix up authentication, authorization, accounting, and auditing; a common trap is confusing authentication with authorization, but remember that authentication always comes first. To lock in the concept, use the mnemonic “AAA” for Authentication, Authorization, and Accounting—but note that authentication is the gatekeeper that verifies identity before any permissions or logs come into play.
This CC practice question tests your understanding of security principles. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
A company wants to implement a security control that ensures users are who they claim to be before granting access to a system. Which type of control should they prioritize?
Auditing
Why wrong: Auditing is a review process, not a preventive control.
Authentication
Authentication verifies identity, which is the first step in access control.
Authorization
Why wrong: Authorization occurs after authentication to define permissions.
Accounting
Why wrong: Accounting tracks user actions after access is granted.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Authentication
Authentication verifies identity. Authorization determines permissions. Accounting tracks actions. Auditing reviews logs.
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.
Auditing
Why it's wrong here
Auditing is a review process, not a preventive control.
Authentication
Why this is correct
Authentication verifies identity, which is the first step in access control.
Related concept
Authentication checks who the user is.
Authorization
Why it's wrong here
Authorization occurs after authentication to define permissions.
Accounting
Why it's wrong here
Accounting tracks user actions after access is granted.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
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: Authentication — Authentication verifies identity. Authorization determines permissions. Accounting tracks actions. Auditing reviews logs.
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
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.
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