What file transfer is achieved by the command 'copy start tftp'?

The command 'copy start tftp' is designed to transfer the configuration file from NVRAM to a TFTP (Trivial File Transfer Protocol) server. When you use this command, the system fetches the startup configuration file stored in NVRAM—where the device retains its configuration settings when powered down—and sends it to the specified TFTP server.

This operation is essential for backing up configurations because it ensures that the configuration file is saved externally, providing a recovery option in case of device failure or misconfiguration. In environments where network devices are managed and configured, this command becomes crucial as it facilitates configuration management and documentation practices.

The command does not involve RAM or directly transferring files from RAM to NVRAM or other locations, which is why those alternatives do not apply to this command's function. This is why the correct answer focuses on the transfer from NVRAM to the TFTP server.