Unit 6.9: Remote Login (TELNET) | IT 231 BBA Slides

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Unit 6.9

Remote Login (TELNET)

IT 231: IT and Applications (BBA)

What is TELNET?

TELNET (Teletype Network) is an early network protocol used to provide a bidirectional interactive text-oriented communication facility.

  • Allows users to connect to a remote computer.
  • Acts as a "dumb terminal" passing keystrokes directly to the server.
  • Commonly used for remote administration of servers and routers.

How It Works

  1. Client Request: Connection is established via an IP and port (usually port 23).
  2. Authentication: Username and password are requested.
  3. Execution: Commands are executed remotely.
  4. Output: Text output is returned to the user's screen.

The Security Vulnerability ⚠️

TELNET transmits all data in plain text, including usernames and passwords!

  • Susceptible to network sniffing.
  • Largely replaced by SSH (Secure Shell) which encrypts all traffic.
  • Rarely used today on public networks.

Thank You & Q&A

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