Note for Data Communication and Computer Network - DCCN By JNTU Heroes

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Data Communication and Computer Network Data Communication Lecture Notes

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Data Communication and Computer Network About the Tutorial This tutorial gives very good understanding on Data Communication and Computer Networks. After completing this tutorial, you will find yourself at a moderate level of expertise in knowing DCN, from where you can take yourself to next levels. Audience This tutorial is prepared for the beginners to help them understand Data Communication and Computer Networks. Prerequisites Before proceeding with this tutorial, you need a basic understanding of Computer. You should know the basics of input and output devices, primary and secondary memory, and operating system. i

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Data Communication and Computer Network Contents About the Tutorial ..................................................................................................................................... i Audience .................................................................................................................................................... i Prerequisites .............................................................................................................................................. i Disclaimer & Copyright .............................................................................................................................. i Contents ................................................................................................................................................... ii 1. OVERVIEW ............................................................................................................................ 1 Classification of Computer Networks ........................................................................................................ 1 Geographical Span .................................................................................................................................... 1 Inter-Connectivity ..................................................................................................................................... 1 Administration .......................................................................................................................................... 2 Network Architecture ............................................................................................................................... 2 Network Applications ............................................................................................................................... 2 2. TYPES OF COMPUTER NETWORKS ........................................................................................ 3 Personal Area Network ............................................................................................................................. 3 Local Area Network................................................................................................................................... 3 Metropolitan Area Network ..................................................................................................................... 4 Wide Area Network .................................................................................................................................. 5 Internetwork............................................................................................................................................. 6 3. NETWORK LAN TECHNOLOGIES ............................................................................................ 8 Ethernet .................................................................................................................................................... 8 Fast-Ethernet ............................................................................................................................................ 8 Giga-Ethernet............................................................................................................................................ 8 Virtual LAN................................................................................................................................................ 9 4. COMPUTER NETWORK TOPOLOGIES................................................................................... 10 Point-to-Point ......................................................................................................................................... 10 Bus Topology .......................................................................................................................................... 10 ii

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Data Communication and Computer Network Star Topology .......................................................................................................................................... 11 Ring Topology ......................................................................................................................................... 12 Mesh Topology ....................................................................................................................................... 13 Tree Topology ......................................................................................................................................... 14 Daisy Chain ............................................................................................................................................. 15 Hybrid Topology...................................................................................................................................... 15 5. COMPUTER NETWORK MODEL ........................................................................................... 17 Layered Tasks.......................................................................................................................................... 17 OSI Model ............................................................................................................................................... 18 Internet Model ....................................................................................................................................... 19 6. COMPUTER NETWORK SECURITY ........................................................................................ 20 Secret Key Encryption ............................................................................................................................. 21 Public Key Encryption ............................................................................................................................. 21 Message Digest ....................................................................................................................................... 21 7. PHYSICAL LAYER INTRODUCTION ........................................................................................ 22 Signals..................................................................................................................................................... 22 Transmission Impairment ....................................................................................................................... 22 Transmission Media ................................................................................................................................ 23 Channel Capacity .................................................................................................................................... 23 Multiplexing............................................................................................................................................ 24 Switching ................................................................................................................................................ 24 8. DIGITAL TRANSMISSION ...................................................................................................... 25 Digital-to-Digital Conversion ................................................................................................................... 25 Line Coding ............................................................................................................................................. 25 Unipolar Encoding ................................................................................................................................... 26 Polar Encoding ........................................................................................................................................ 26 Bipolar Encoding ..................................................................................................................................... 28 iii