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Computer Networks

Himachal Pradesh Board · Class 12 · Computer Science

Quick revision notes for Computer Networks — Himachal Pradesh Board Class 12 Computer Science. Key concepts, formulas, and definitions for last-minute revision.

44 questions92 flashcards5 concepts

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A diagram showing how a repeater extends the range of a communication system by receiving, amplifying, and retransmitting signals.
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Key Topics to Revise

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1. Basics of Computer Networks

  • A network is a group of two or more similar things or people interconnected with each other.
  • A computer network is an interconnection among two or more computers or computing devices.
  • A network allows sharing of data and resources such as printers and storage.
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2. Evolution of Networking

  • ARPANET was a 1960s U.S. Department of Defence research project.
  • ARPANET connected academic and research institutions for scientific collaboration.
  • The first message was communicated between UCLA and Stanford Research Institute.
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3. Types of Networks

  • Computer networks are broadly classified as PAN, LAN, MAN, and WAN.
  • PAN covers about 10 metres.
  • A mobile phone connected to a laptop through USB forms a wired PAN.
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4. Networking Devices

  • Common networking devices include modem, Ethernet card or NIC, RJ45, repeater, hub, switch, router, and gateway.
  • A modem converts between analog signals and digital bits.
  • The sender's modem modulates digital data into analog signals.

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Full Notes

Key Concepts

A network is a groupARPANET was a 1960s UPANModem stands for MOdulator DEModulatorAn Ethernet card

Frequently Asked Questions

What are the important topics in Computer Networks for Himachal Pradesh Board Class 12 Computer Science?
Computer Networks covers several key topics that are frequently asked in Himachal Pradesh Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Computer Networks — Himachal Pradesh Board Class 12 Computer Science?
Understand the core concepts first, then work through the 44 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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