Which command is used to configure a static IP address on a Cisco interface?

To configure a static IP address on a Cisco interface, the command used is structured as "ip address [address] [mask]". This command allows the network administrator to assign a specific IP address along with its subnet mask directly to an interface.

When entering this command in the interface configuration mode on a Cisco device, it ensures that the device is identified on the network with a specific static address. This static assignment does not change unless manually reconfigured, making it ideal for servers or devices that need a consistent address.

The format includes the actual IP address you want to assign and the subnet mask associated with that address. For example, using "ip address 192.168.1.1 255.255.255.0" would configure the interface with the specified IP address and mask, enabling proper routing and communication within the subnet.

Other configurations that were presented do not adhere to the correct syntax or command structure used in Cisco IOS, hence are not valid alternatives. Understanding the precise command syntax is crucial for effective network configuration and management.