Name: FTP protocol

Category: Communication protocols

More about ftp protocol

Introduction to FTP Protocol
File Transfer Protocol (FTP) is a standard network protocol used to transfer files between a client and a server over the Internet or a local network. It operates on the application layer of the TCP/IP model and uses separate channels for control and data transfer. FTP is widely used for uploading and downloading files to web servers, sharing large files, and managing remote directories. It requires authentication, typically with a username and password, though some FTP servers support anonymous access for public file sharing.

How FTP Works
FTP operates in two modes: active and passive. In active mode, the client initiates a connection to the server and specifies a port for data transfer, while the server actively sends data to that port. In passive mode, which is commonly used to bypass firewalls, the server provides a port for the client to establish a data connection. FTP uses two ports: port 21 for control commands and port 20 for data transfer. It supports both binary and ASCII file transfers, ensuring compatibility across different systems.

Security and Modern Alternatives
Traditional FTP lacks encryption, making it vulnerable to security threats such as password interception and data breaches. To address this, Secure FTP (SFTP) and FTP Secure (FTPS) have been developed. SFTP, based on the SSH protocol, provides secure file transfers by encrypting data and authentication credentials. FTPS, on the other hand, adds SSL/TLS encryption to standard FTP connections. Despite these security improvements, many organizations have transitioned to more modern file transfer methods such as cloud storage and HTTP-based file sharing for greater security and convenience.