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Data Communication and Networking

NIOS · Class 12 · Computer Science

Quick revision notes for Data Communication and Networking — NIOS Class 12 Computer Science. Key concepts, formulas, and definitions for last-minute revision.

45 questions24 flashcards5 concepts

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An illustration showing various computing devices (desktops, laptops, smartphones, printers, servers) interconnected to form a basic computer network, highlighting data and resource sharing.
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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)
2

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
3

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
4

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

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Full Notes

Key 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 Data Communication and Networking - Complete Chapter Overview, Data Communication System Process, Data Communication and Networking - Comprehensive Overview. These are the concepts NIOS Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Data Communication and Networking — NIOS Class 12 Computer Science?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and 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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