Computer Networks · Class 12 · Network Protocols · Calls and Remote Login
networksprotocols⏱️ 5 min read
TELNET
A computer in a branch office 700 km away has a problem, and the system administrator is at head office. Instead of catching a train, they log in to that computer over the network and fix it from their own desk.
1What TELNET is
TELNET
TELNET is a protocol used to access a remote computer over a network. The user logs in to the far computer and types commands that run on that computer, as if they were sitting in front of it. This is called remote login.
TELNET is usually expanded as Teletype Network. CBSE asks what it is used for, which is the line in the box above.
Using a computer in another city
Choose a command, then play the session. Drag sideways to turn.
2How a remote login session goes
- The user starts a TELNET session with the remote computer.
- They log in with that computer’s user name and password.
- Every command they type is sent to the remote computer and runs there.
- Only the result is sent back to their screen.
Think of a remote-controlled car
The car does the driving; you only press the buttons and watch. With TELNET, the far computer does all the work, and your computer is just the remote control.
Beyond the syllabus: why SSH replaced it
TELNET sends everything as plain text, the password included, so anyone tapping the line can read it — as the lab shows. Today remote login is done with SSH (Secure Shell), which encrypts the session. For the exam, the remote login protocol is TELNET.
3From the board papers
1
What is the use of TELNET?CBSE sample paper 2022-23
1 mark▶Show the answer
TELNET is used to access a remote computer / network. — CBSE’s marking scheme answer.
2
The System Administrator does remote login to any PC, if any requirement arises. Name the protocol, which is used for the same.CBSE compartment exam 2023 (case study)
1 mark▶Show the answer
TELNET.
3
The Manager at Nagpur wants to remotely access the computer in Admin block in Vijayawada. Which protocol will be used for this?CBSE board exam 2025 (case study)
1 mark▶Show the answer
TELNET.
4Check yourself
Quick Check
A command typed in a TELNET session — where does it run?
Quick Check
Which case-study sentence is asking for TELNET?