RFC 959 - File Transfer Protocol (FTP)

RFC 959 is a document that details the File Transfer Protocol (FTP), a network protocol designed to transfer files between computers. The document provides a comprehensive overview of FTP’s history, terminology, model, and functions. It explains the protocol’s architecture, including its control and data connections, and defines various parameters like data representation, file structure, and transmission modes. The document also outlines the various FTP commands, their syntax, and the expected reply codes for successful and unsuccessful operations. Finally, the document includes state diagrams to illustrate the flow of commands and replies between a client and server.