Which protocol is most efficient for transferring large files?

• A. File Transfer Protocol (FTP)
• B. Simple Mail Transfer Protocol (SMTP)
• C. Hypertext Transfer Protocol (HTTP)
• D. Secure Shell (SSH)

Answer: (A)

Transferring large files efficiently relies on a protocol built specifically for moving files rather than just exchanging messages. FTP is designed for file transfer between systems, using a control connection to manage commands and a separate data connection to carry the file contents. This setup supports reliable, large-scale transfers, binary mode to preserve data exactly, and features like restart (to resume interrupted transfers) and optional compression to save bandwidth. The other options serve different purposes: SMTP handles email with size limits and routing constraints; HTTP is a general web transfer protocol that isn’t optimized for bulk, resumable file transfers; SSH is for secure remote access (with SFTP/SCP available, but SSH by itself isn’t a dedicated file-transfer protocol). For efficiency with large files, FTP fits best.