Which protocol is most efficient for transferring larger files?

The File Transfer Protocol (FTP) is specifically designed for transferring files over a network, making it the most efficient option for this purpose, especially when dealing with larger files. FTP supports various functionalities that optimize file transfer, such as resuming interrupted downloads, transferring files in binary or ASCII mode, and managing file permissions.

While HTTP can also be used to transfer files, it is primarily designed for document retrieval and does not offer the same level of control or efficiency for file management as FTP. SMTP is mainly used for sending emails and is not suited for transferring large files, as it typically has size limits on attachments. Telnet, on the other hand, is a protocol used for text-based communication between devices and does not specialize in file transfers at all. Hence, FTP stands out as the best option for the efficient transfer of larger files due to its inherent design and capabilities.