Remote Login Protocol: TELNET (and Modern Alternatives)
Remote login means accessing a computer system over a network to run commands as if you were sitting at a terminal. In traditional networking multiple-choice questions like the one you provided, the intended answer for remote login is TELNET—a protocol specifically designed to provide a text-based remote terminal session over a network.
To connect this to your options:
- SMTP is used for sending email, not interactive terminal sessions.
- HTTP is used for web communication (request/response browsing), not remote command-line login.
- FTP is used for transferring files, not interactive login.
- TELNET is used for remote terminal login (interactive sessions).
A common supporting context is that TELNET provides remote access via a terminal-like interface over TCP (historically on port 23), whereas SSH is the modern, secure replacement for TELNET in many environments.
Keywords: remote login TELNET SSH SMTP
Note: Many curricula use TELNET specifically as the “remote login” protocol in exam contexts, even though SSH is generally preferred for security in real deployments.
TELNET vs SSH (Remote Login Protocols) — Networking Overview
How to choose the correct option
When you see a question “Which protocol is used for remote login?” you can eliminate options by matching the protocol’s purpose:
- TELNET: interactive terminal/console access (remote login).
- SMTP: email sending.
- HTTP: web browsing (hypertext transfer).
- FTP: file transfer.
A simple elimination rule: If the protocol is for “mail” or “files” or “web pages,” it’s not remote login; if it’s for a “terminal/interactive session,” it is.
Keywords: application protocol interactive session transport protocol
Selecting the remote login protocol from the given options
- 1Step 1
Remote login requires an interactive terminal session on a remote host, not just file transfer or web/email exchange.
- 2Step 2
SMTP focuses on email; HTTP focuses on web pages; FTP focuses on transferring files; TELNET provides terminal-like remote access.
- 3Step 3
TELNET is the classic protocol used for remote login in such multiple-choice questions.
- 4Step 4
Although SSH is modern and secure, the provided options match TELNET as the remote login protocol.
Exam shortcut
If you see “remote login” + multiple choices (SMTP/HTTP/FTP/TELNET), pick TELNET—it’s the only one designed for interactive terminal access.
Security caution: TELNET is not secure by default
TELNET provides plaintext login/commands, so credentials can be intercepted. In real systems, SSH is typically used instead of TELNET.
Remote login protocol evolution (high level)
TELNET
Early networksProvides text-based interactive remote terminal sessions; widely taught and used in classic contexts."
SSH
Modern practiceReplaces TELNET for remote login by adding encryption and stronger security properties."
Quick FAQ: Why not the other options?
Protocol–Purpose Matching (from your options)
Interactive remote terminal login corresponds to TELNET among the provided choices.
Knowledge Check
Which protocol is used for remote login?