Which command is used to view the current configuration on a Cisco device?

The command used to view the current configuration on a Cisco device is "show running-config." This command displays the active configuration of the device that is currently in use, including all interface settings, routing protocols, access control lists, and any other configurations that have been applied. It is particularly useful for network administrators to verify settings, troubleshoot issues, or audit the current state of the device.

The other options provided do not represent valid commands in Cisco's command-line interface. "view config" is not a recognized command; similarly, "config show" and "list current-config" do not exist in the Cisco command set. The precise syntax and structure of Cisco IOS commands are important for correctly managing network devices, and "show running-config" is the standardized method for retrieving the current configuration on these devices.