The client "listens" for a connection from the server. The client sends a PORT command to the server, and the server initiates the data transfer back to the client.
Users interact with FTP through specific commands, while the server provides status updates via three-digit return codes. The client "listens" for a connection from the server
Typically uses Port 21 to transmit commands and responses, such as login credentials and directory navigation. Typically uses Port 21 to transmit commands and
Understanding FTP: The Foundation of Networked File Sharing The is a venerable standard network protocol used to move computer files from one host to another over a TCP-based network. Developed in the early 1970s, it remains a fundamental tool for web developers, system administrators, and organizations needing to manage large volumes of data. What is FTP and How Does It Work? What is FTP and How Does It Work
FTP operates on a . A user runs an FTP client on their local machine and connects to a remote FTP server. The protocol is unique because it uses two separate connections to facilitate communication:
The client sends a PASV command, asking the server to "listen" on a specific port. The client then initiates the data connection to that port. This is generally preferred for modern networks to avoid firewall blocking. Common FTP Commands and Return Codes
Understanding how FTP handles data connections is critical for troubleshooting firewall issues.
