On which port does Telnet operate?

Telnet operates on port 23, which is standard for this protocol. Telnet is a network protocol used to provide a command-line interface for communication with a remote device or host. It allows for unencrypted text-based communication over a network, enabling remote management and access to devices such as routers and switches. The use of port 23 is defined by IANA (Internet Assigned Numbers Authority) for Telnet specifically, allowing devices to recognize incoming Telnet requests.

The other port numbers listed correspond to different protocols: port 21 is used for FTP (File Transfer Protocol), port 25 is associated with SMTP (Simple Mail Transfer Protocol) for email transmission, and port 80 serves HTTP (Hypertext Transfer Protocol) for web traffic. Understanding these port assignments helps in recognizing the functionalities and applications of various network protocols.