What command is used to display the current configuration on a Cisco device?

The command that displays the current configuration on a Cisco device is indeed "show running-config." This command provides a comprehensive view of the active configuration settings by displaying all the configurations that are currently in effect in the device's memory.

When you enter "show running-config," you can see various configuration details, such as interface settings, routing protocols, access control lists, and more. This command is essential for network administrators to troubleshoot issues, verify configurations, and ensure that the device is operating as intended.

In contrast, other commands listed do not achieve the same result. For instance, "show interfaces" specifically displays details about the network interfaces, such as their status and statistics, but does not show the overall configuration. "display configuration" is not a recognized command in Cisco’s IOS command set and would not execute successfully. Similarly, "get config" is not a valid command in Cisco IOS, making it ineffective for this purpose. Thus, "show running-config" is the correct and standard command used for displaying the current configuration on a Cisco device.