FTP (File Transfer Protocol)
FTP (File Transfer Protocol) is a standard network protocol used to transfer files between a client and a server over a TCP/IP connection. Developed in the early 1970s, FTP remains one of the oldest and most widely used protocols for uploading, downloading, and managing files on remote servers. It operates on a client-server model where users connect using credentials, then navigate directories, upload files, or download content.
How FTP Works
FTP uses two separate channels for communication. The command channel (typically port 21) handles authentication and instructions like navigating directories, renaming files, and setting transfer modes. The data channel (typically port 20 or a dynamically assigned port) handles the actual file transfer. FTP supports both active and passive connection modes, with passive mode more common in modern setups because it works better with firewalls and NAT configurations. Transfers can use ASCII mode for text files or binary mode for images, executables, and other non-text data.
FTP Clients and Tools
While basic FTP access is possible through command-line tools and some web browsers, dedicated FTP software provides a far more practical experience. Popular clients like FileZilla, Cyberduck, and WinSCP offer graphical interfaces with drag-and-drop file management, transfer queues, directory synchronization, and bookmarked server connections. These tools support not just plain FTP but also its more secure variants.
Security Considerations
Standard FTP transmits credentials and data in plain text, making it vulnerable to interception. Modern deployments should use SFTP (SSH File Transfer Protocol) or FTPS (FTP Secure), which encrypt both authentication and data transfer. SFTP, which runs over SSH on port 22, has become the preferred option because it uses a single encrypted connection and is simpler to configure with firewalls. Many web hosting providers now disable plain FTP entirely and require SFTP connections for file management.
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