Which Internet protocol allows for file transfer without corruption or alteration?

File Transfer Protocol (FTP) is specifically designed for transferring files over the Internet and ensures that file contents are not corrupted or altered during the transfer process. FTP operates in a client-server model and uses control and data connections to facilitate the transfer of files. It checks the integrity of the files being transferred by implementing error-checking mechanisms, ensuring that the files received are identical to the files sent.

In contrast, other protocols mentioned do not focus primarily on file transfer integrity. For instance, Hypertext Transfer Protocol (HTTP) is used for transmitting hypertext over the web but does not guarantee file integrity for all types of files being transferred. Secure Copy Protocol (SCP) is also used for transferring files securely but, while it encrypts the transfer, it is not the primary focus of managing file integrity in the same way that FTP does. Transmission Control Protocol (TCP) is a foundational protocol for network communication and ensures data transmission reliability overall, but it does not specifically handle file transfers or provide the same dedicated file management capabilities as FTP.