Computer Networks · Class 12 · Network Protocols
networksprotocols⏱️ 8 min read
Which Protocol, When?
Nine protocols, nine jobs. In the exam you will be asked for a full form, for what one is used for, for the difference between two of them, or — in the case study — which one a company needs. This page puts them side by side.
1All nine on one picture
Nine protocols, one computer
Pick a protocol to see what it talks to. Drag sideways to turn.
2Full forms and jobs
| Protocol | Full form | Used for |
|---|---|---|
| 📦 TCP/IP | Transmission Control Protocol / Internet Protocol | Cuts data into packets, addresses and delivers them |
| ↔️ PPP | Point to Point Protocol | A direct link between two devices |
| 🌐 HTTP | HyperText Transfer Protocol | Fetches web pages |
| 🔒 HTTPS | HyperText Transfer Protocol Secure | Fetches web pages, encrypted |
| 📁 FTP | File Transfer Protocol | Transfers files |
| 📤 SMTP | Simple Mail Transfer Protocol | Sends email |
| 📥 POP3 | Post Office Protocol version 3 | Retrieves email from the mail server |
| 📞 VoIP | Voice over Internet Protocol | Voice and video calls over the Internet |
| ⌨️ TELNET | Teletype Network | Logs in to a remote computer |
Remember the letters
The T in HTTP, FTP and SMTP is Transfer — each one moves something: hypertext, files, mail. The S at the end of HTTPS is Secure. POP3 is a post office you collect mail from.
3The pairs CBSE asks about
| Pair | The difference in one line | Asked in |
|---|---|---|
| HTTP vs HTTPS | HTTPS encrypts the data (SSL/TLS); HTTP sends it as plain text | SQP 2023-24; compartment 2025 |
| HTTP vs FTP | HTTP fetches web pages to view; FTP transfers files between computers | Compartment 2024 |
| FTP vs SMTP | FTP transfers files; SMTP sends email | Compartment 2026 |
| SMTP vs POP3 | SMTP sends mail towards the receiver; POP3 retrieves it from the mail server | Each asked on its own: SMTP SQP 2024-25, POP3 SQP 2025-26 |
| TCP vs IP | TCP splits into packets and reassembles them in order; IP addresses and routes each packet | Board 2023; compartment 2025 (full forms) |
4Reading a case study
The last part of the 5-mark network question often names a need and asks for a protocol. Look for these words:
| If the question says… | Answer | Set in |
|---|---|---|
| video conferencing / online audio-visual sessions / live interaction | VoIP | SQP 2022-23; board 2022, 2026; compartment 2022, 2026 |
| voice communication / phone calls over the Internet | VoIP | Board 2025; compartment 2024 |
| remote login / remotely access a computer | TELNET | Board 2025; compartment 2023 |
| transfer files between branches | FTP | Board 2023; SQP 2024-25 |
| retrieving emails from a mail server | POP3 | SQP 2025-26 |
| sending emails | SMTP | SQP 2024-25; board 2024 |
| accessing a web page | HTTP | Compartment 2026; board 2026 |
| secure browsing / encrypted web pages | HTTPS | SQP 2023-24; compartment 2025 |
Video conferencing is VoIP
CBSE’s own marking scheme answers “a protocol to provide a video conferencing solution” with VoIP. Do not write HTTP just because the meeting happens in a browser.
Which protocol?
Read the situation and pick the protocol.
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The Delhi and Mumbai offices hold a video conference every Monday
Every question CBSE has set on protocols is collected, with answers, on the next page: Board Questions.
5Check yourself
Quick Check
Which protocol carries the data of all the others across the Internet?
Quick Check
A company wants its managers in Delhi and Ambala to talk live over the Internet. Which protocol should be suggested?