Which keyword is used to remove a configured command?

The keyword used to remove a configured command in Cisco devices is "no." This command is specifically designed to negate or disable a previously configured setting or command in the device's configuration.

For instance, if you have configured an interface with the command "ip address 192.168.1.1 255.255.255.0," using the command "no ip address" would effectively remove that IP address configuration from the interface. This functionality allows network administrators to easily modify configurations without needing to erase and reconfigure them from scratch, thus streamlining the management of network devices.

The other options do not align with the conventions used in Cisco IOS. Keywords like "remove," "delete," and "discard" are not recognized commands for negating or removing configurations within the IOS command-line interface. Therefore, understanding the specific use of the "no" command is crucial for effective network configuration and management in Cisco environments.