Which protocol is known for transferring large files over the Internet?

File Transfer Protocol (FTP) is specifically designed for transferring files across the Internet, making it the ideal choice for large file transfers. FTP provides a set of rules that allows users to upload and download files to and from a server efficiently. It operates over a TCP/IP connection, ensuring reliable data transmission, which is crucial when dealing with large files to prevent corruption or loss of data during the transfer.

In contrast, the other protocols mentioned serve different primary purposes. Simple Mail Transfer Protocol (SMTP) is primarily used for sending emails, while Hypertext Transfer Protocol (HTTP) is used for transferring web pages and associated content. Internet Protocol (IP), on the other hand, is a foundational networking protocol that is responsible for addressing and routing packets of data but does not handle file transfers specifically. Thus, for large file transfers, FTP stands out as the correct and most effective protocol.