Which of the following ports does a telnet application utilize?

Telnet operates using port 23. This service allows for remote terminal connection to devices over a network. When a user connects to a device using Telnet, the communication is established through this designated port, enabling a command-line interface to interact with the remote system. Telnet uses a simple text-based protocol, allowing users to execute commands on the remote system as if they were using it locally.

The use of port 23 for Telnet is significant because it is distinct from other common ports associated with different services. For example, port 21 is designated for FTP, port 80 is used for HTTP web traffic, and port 443 is for HTTPS, which provides secure web browsing. Understanding the specific port assignments helps clarify how different services operate within networks and ensures that configurations related to firewalls and security settings can be accurately applied.