Cisco Cyber Security Practice Exam

Which of the following is NOT considered an access control security service?

1. Authentication

2. Authorization

3. Validation

4. Accounting

The correct answer is: Validation

The correct choice is validation, as it does not specifically fit into the standard framework of access control security services. In the context of access control, the primary security services that regulate how users gain access to resources include authentication, authorization, and accounting. Authentication is the process of verifying the identity of a user or system. This step is crucial because it ensures that only legitimate users are allowed to access the system. Authorization, on the other hand, is the process that follows authentication. It determines what an authenticated user is allowed to do within the system, such as what resources they can access or what operations they can perform. Accounting (or auditing) refers to the tracking of user activities and resource access, allowing organizations to maintain a log of who accessed what data and when. This is important for security compliance and for analyzing potential threats or breaches by examining logs. Validation, while it involves checking information for correctness or integrity, does not serve as an access control service within this standard model. Therefore, it stands outside the core components that directly manage access to resources in security contexts.