Chapter 5 of 29
Revision Notes
Data Communication and Networking — Revision Notes
NIOS · Class 12 · Computer Science
Data Communication and Networking revision notes for NIOS Class 12 Computer Science: 4 topics in quick points.
45 questions24 flashcards5 concepts
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Key Topics to Revise
1
5.1 Fundamentals of Data Communication
- Data communication refers to transmission of digital data between two or more computers through a network
- Basic elements: Transmitter (converts information into suitable form), Channel (physical medium for transmission), Receiver (receives transmitted information)
- Three transmission modes exist: Simplex (one-directional), Half Duplex (both directions but not simultaneously), Full Duplex (bidirectional simultaneously)
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5.2 Communication Terminology
- Electromagnetic (E-M) Spectrum: Range of all possible frequencies of electromagnetic radiation from low-frequency radio waves to high-frequency gamma rays
- Different frequencies suit different communication purposes - not all frequencies are suitable for human communication
- Bandwidth: Range of frequencies that make up a signal
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5.3 Transmission Media
- Transmission media are physical or wireless pathways through which data travels
- Guided media: Provide physical path between transmitter and receiver
- Unguided media: Use wireless transmission through air, vacuum, or water
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5.4 Computer Networks and Devices
- Computer Network: Group of interconnected computers sharing resources and information
- Network Devices: Hardware components enabling communication (rodem, router, switch, hub, gateway, bridge)
- Modem: Converts digital data to analog and analog to digital for internet connectivity
Get complete notes with diagrams and examples
Full NotesKey Concepts
A data communication system consistsThere are three ways data canAnalog transmission uses continuous signalsThe electromagnetic (EBandwidth is the range of frequencies
Frequently Asked Questions
What are the important topics in Data Communication and Networking for NIOS Class 12 Computer Science?
Key topics in Data Communication and Networking include 1 Fundamentals of Data Communication, 2 Communication Terminology, 3 Transmission Media, 4 Computer Networks and Devices. Study these first, then practise questions on each for the NIOS Class 12 board exam.
How should I revise Data Communication and Networking for the NIOS Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Data Communication and Networking. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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