Cheat sheet · Class 12 · CBSE · Science Computer Science
Data Communication cheat sheet
The whole chapter on one page: key formulas, facts and the points to remember, for quick revision before a test.
CBSE Class 12 · Computer Science
Cheat sheet
Chapter 12Data Communication
Sender → Medium → Receiver, following a Protocol.
1. Components
- sender
- receiver
- message
- medium
- protocol
- Bandwidth (Hz) and data transfer rate (bps).
- Modes: simplex, half-duplex, full-duplex.
2. Transmission Media
| Wired | Wireless |
|---|---|
| Twisted pair (cheap, short distance) | Radio waves |
| Coaxial cable (TV) | Microwaves (line of sight) |
| Optical fibre (fast, light-based) | Infrared (short range) |
3. Protocols
| Protocol | Use |
|---|---|
| HTTP / HTTPS | web pages (secure with HTTPS) |
| FTP | file transfer |
| SMTP / POP3 | send / receive email |
| TCP/IP | core internet protocols |
| PPP | point-to-point link |
4. Key Points
- Circuit vs packet switching.
- Mobile generations: 1G analog to 5G.
- Fibre is immune to EM interference.
- Bluetooth and Wi-Fi are wireless.
Remember: Components | modes | media | protocols
Data Communication: questions and notes
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