Which login class permission will allow a user to use the telnet utility?
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A. B. C. D.A
The correct answer is D. shell permission.
Explanation:
Junos OS provides a flexible and secure authentication and authorization system that allows network administrators to configure different levels of access to users based on their roles and responsibilities. Junos OS uses the concept of login classes to define a set of permissions and attributes that apply to a group of users.
Each login class contains a set of permissions that determine the user's level of access to various system resources, including the CLI shell, file system, network services, and other system utilities. There are several predefined login classes in Junos OS, such as super-user, operator, read-only, and unprivileged. In addition, network administrators can create custom login classes with specific permissions and attributes.
To use the telnet utility, a user must have shell access to the Junos OS CLI. The shell permission allows the user to access the CLI shell and run various system utilities, including telnet. Therefore, the correct answer is D. shell permission.
Network permission is typically used to allow or deny access to network services, such as FTP, TFTP, SSH, and SNMP. Maintenance permission is used to allow or deny access to system maintenance functions, such as software upgrades, configuration backups, and system diagnostics. Supervisor permission is a custom login class that provides full administrative access to the system, including the ability to create and modify login classes and user accounts. However, none of these permissions are directly related to the use of the telnet utility.