Which of the following ports is primarily used for FTP?

The primary port used for FTP (File Transfer Protocol) is 21. FTP operates over this designated port to facilitate the transfer of files between a client and a server. Port 21 is used for sending commands and control information from the client to the server, establishing the necessary communication for file transfers.

The other ports listed serve different purposes: Port 25 is commonly used for SMTP (Simple Mail Transfer Protocol), which is responsible for sending emails. Port 80 is used for HTTP (Hypertext Transfer Protocol), which is the foundational protocol for browsing the internet and loading web pages. Port 443 is used for HTTPS (HTTP Secure), which is an extension of HTTP and provides a secure communication channel over a computer network.

Understanding that FTP specifically utilizes port 21 is crucial for configuring and managing file transfer operations effectively, distinguishing it from other protocols that operate on different ports.