CompTIA Network+ Practice Test

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What is the default port number used by Telnet?

  1. tcp/22

  2. tcp/23

  3. tcp/25

  4. tcp/80

The correct answer is: tcp/23

The default port number used by Telnet is 23. Telnet is a network protocol used to provide a command-line interface for communication with a remote device or server. This protocol operates over TCP, and the designated port number 23 allows clients to establish a connection to a server for remote management and configuration. While other options represent commonly used ports for different protocols—such as port 22 for SSH, port 25 for SMTP, and port 80 for HTTP—it is important to note that they serve distinct purposes and are not associated with the Telnet protocol. Port 23 remains the standard for Telnet, emphasizing its role as a legacy protocol in network communications.

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