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Computer Networks – Complete Summary Notes for BCA, MCA & IT Students

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2022/2023 Written for academic year
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Abacus College, Oxford
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Computer science
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These Computer Networks Summary Notes are written in simple, concise, and exam-focused language, ideal for BCA, BSc IT, MCA, and engineering students who want to understand networking concepts quickly and effectively. Contents Include: Introduction to Computer Networks Types of Networks – LAN, MAN, WAN, PAN Network Topologies and Architectures OSI and TCP/IP Models Explained Networking Devices – Switches, Routers, Hubs, Gateways IP Addressing, Subnetting, and Classes Network Protocols – HTTP, FTP, TCP, UDP, SMTP, DNS Network Security Basics Wireless Networking & Internet Concepts Quick Revision Tables, Diagrams & Key Points Why Students Love This File: Clear, concise, and easy-to-understand format Includes diagrams, tables, and flowcharts for better visualization Perfect for last-minute exam revision or assignments Printable PDF – organized and student-friendly Based on reliable textbooks and academic sources

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Computer Networks – Summary
Notes

Introduction


A computer network is a collection of interconnected
devices that share resources and data.
Networks are designed to enable communication, resource
sharing, and data exchange.
---


OSI Model (Open Systems Interconnection)


The OSI model has 7 layers, each with specific functions.


Layer Function Examples


7. Application User interface, network services HTTP, FTP,
SMTP, DNS

, 6. Presentation Data translation, encryption,
compression SSL, JPEG, ASCII
5. Session Session management between hosts APIs,
NetBIOS
4. Transport Reliable data transfer, error recovery TCP,
UDP
3. Network Logical addressing, routing IP, ICMP
2. Data Link Error detection, framing Ethernet, PPP
1. Physical Transmission media, signaling Cables, Hubs




Mnemonic: “Please Do Not Throw Sausage Pizza Away”
(Physical → Application)
---


🖧 TCP/IP Model


The TCP/IP model has 4 layers that map to the OSI model:


TCP/IP Layer Corresponding OSI Layers Protocols
Connected book
image
James F. Kurose, Keith W. Ross Computer Networking
Publisher: 2017 ISBN: 9780133594140 Edition: Unknown

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