CompTIA CASP+ Practice Test

What command might a system administrator need to use to successfully restart an unresponsive DNS service on a Linux server?

1. service restart dns

2. sudo service bind restart

3. systemctl bind restart

4. bin/ssh service restart

The correct answer is: sudo service bind restart

To successfully restart an unresponsive DNS service on a Linux server, the correct command involves using the service management tools that are standard in most Linux distributions. The command that specifically targets the BIND (Berkeley Internet Name Domain) DNS service is commonly used in Linux environments. The choice that involves "sudo service bind restart" accurately addresses this need because "service" is a command-line utility for managing services in older init systems and can also be used in systems that adopt compatibility methods. The "bind" part denotes the specific DNS service that is being controlled, and "restart" is the action the administrator is trying to accomplish. The use of "sudo" indicates that the command is being run with elevated privileges, which is often necessary for administrative tasks like restarting a service. Other options provided may not effectively achieve the desired action or might reference incorrect command syntax. For example, using "systemctl" suggests a newer systemd-based environment, and while that could be applicable on certain systems, it's essential to use the correct syntax, which this option lacks. Moreover, the option referring to "bin/ssh service restart" does not correspond to legitimate command syntax for managing services and represents a misinterpretation of command structure in Linux. Thus, the selected command