In a switch stack configuration, which command initiates a device reboot?

The command used to initiate a device reboot in a switch stack configuration is "reload." This command is a standard Cisco IOS command that allows the user to restart the device. When executed, it gracefully terminates all processes running on the device and reinitializes the switch's operating system.

It's important to note that the "reload" command can be configured to occur immediately or after a specified time delay. Furthermore, when dealing with a stack of switches, using this command will reboot the master switch and then all member switches within the stack, ensuring a coordinated restart across the entire configuration.

In contrast, the alternatives do not serve the intended purpose. For example, "reboot switch" and "restart" are not recognized commands in Cisco IOS, leading to a command syntax error. "Power cycle" is a physical action that involves turning off and then turning on the power to the device, which is not controlled through a command line interface and is less formal than using the "reload" command.