Which command provides the total flash memory available on a device?

The command that provides the total flash memory available on a device is "show flash (total)." This command is specifically designed to display information regarding the flash memory, including both total available space and used space. Flash memory is critical for storing the operating system and other applications on Cisco devices, making it important for administrators to monitor its status to ensure optimal device operation.

In contrast, while the "show version" command can provide a variety of system information, including some memory details, it does not specifically break down the flash memory details as thoroughly as the correct command does. The "show flash memory" command would typically be used for checking specific memory operations rather than total capacity. Furthermore, "show memory usage" focuses on the overall RAM usage on the device rather than the details regarding flash memory. Therefore, the command that most directly and clearly provides the total flash memory information is indeed "show flash (total)."