Cisco Certified Internetwork Expert (CCIE) Practice Test

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Which effect does the given configuration have regarding RADIUS authentication?

  1. If the RADIUS server is unreadable, SSH users cannot authenticate

  2. All commands are validated by the RADIUS server before the device executes them

  3. Users accessing the device via SSH and those accessing enable mode are authenticated against the RADIUS server

  4. Users must be in the RADIUS server to access the serial console

The correct answer is: Users accessing the device via SSH and those accessing enable mode are authenticated against the RADIUS server

The configuration that ensures users accessing the device via SSH and those accessing enable mode are authenticated against the RADIUS server is integral to network security. This means that both types of access—whether through SSH for remote management or the enable command for elevated privileges—are subjected to the same authentication policies enforced by the RADIUS server. This approach centralizes user management, allowing for more consistent enforcement of security policies, and enables administrators to maintain user credentials and access privileges in one location. Utilizing RADIUS provides added benefits such as the ability to log authentication attempts, apply policies based on user roles, and quickly revoke access across multiple devices if necessary. RADIUS-based authentication is particularly useful for larger networks, where managing local users on each device would be inefficient and prone to errors. By requiring SSH users and those needing elevated privileges to authenticate against the RADIUS server, network administrators can enhance security by ensuring that only verified users can access sensitive configurations or perform critical tasks. In contrast, the other options either imply a misunderstanding of RADIUS functionality or suggest scenarios that are less relevant in this context, such as limitations on other types of access that do not pertain to the authentication process described for SSH and enable mode access.

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