Computer Networks
CBSE · Class 12 · Computer Science
Quick revision notes for Computer Networks — CBSE Class 12 Computer Science. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Introduction to Computer Networks
- A computer network is an interconnection among two or more computers or computing devices
- Networks allow computers to share data and resources among each other
- Data in networks is divided into smaller chunks called packets
Evolution of Networking
- ARPANET (1960s) - first computer network by U.S. Department of Defence
- 1969: First message between UCLA and Stanford Research Institute
- 1971: Roy Tomlinson develops email and @ symbol
Types of Networks
- Networks classified by geographical area and data transfer rate
- PAN (Personal Area Network) - within 10 metres, personal devices
- LAN (Local Area Network) - single building/campus, high speed (10-1000 Mbps)
Network Devices
- Modem: MOdulator-DEModulator, converts analog to digital signals
- Ethernet Card/NIC: Network Interface Card with unique MAC address
- RJ45: 8-pin connector for Ethernet cables
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What are the important topics in Computer Networks for CBSE Class 12 Computer Science?
Computer Networks covers several key topics that are frequently asked in CBSE Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.
Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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