Which user authentication method is supported by the Junos OS as a last resort alternative?
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A. B. C. D.C
The correct answer to the question is option C, local user database.
The Junos OS supports multiple user authentication methods to authenticate and authorize user access to network devices. These methods include TACACS+, RADIUS, and local user database.
TACACS+ (Terminal Access Controller Access-Control System Plus) and RADIUS (Remote Authentication Dial-In User Service) are centralized authentication methods that allow network administrators to manage user accounts and access policies from a central server. Both TACACS+ and RADIUS provide strong security mechanisms and advanced features like accounting and authorization.
In contrast, the local user database is a decentralized authentication method that stores user account information on each network device. When a user attempts to access the device, the Junos OS checks the local user database for a matching username and password. If the authentication is successful, the user is granted access to the device.
The local user database is typically used as a last resort alternative when the central authentication servers like TACACS+ and RADIUS are unavailable or unreachable. It is also commonly used for initial access to a device before the central authentication servers are configured.
The enable password is not a user authentication method but a device authentication method. It is a password used to access privileged mode on a network device and is typically used in combination with other authentication methods like TACACS+ or RADIUS to provide additional security.