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COMPUTER NETWORKS

CS-203

Lecture-1

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Course Answers the Basic Question:

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How do COMPUTER NETWORKS and

INTERNET Operate?

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Course Composition

  • Four Main Parts

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    • Using and Building Internet Applications

(Chap. 1 - 3)

    • Data Transmission (Chap. 4 - 6)
    • Packet Transmission (Chap. 7-16)
    • Interntworking (Chap. 17-27)
    • Network Applications (Chap. 28-41)

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Part 1: Data Transmission

  • Transmission Media

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  • Local Asynchronous Communication

(RS 232)

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  • Long Distance Communication

(Modems and Carriers)

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Part 2: Packet Transmission

  • Packets and Frames

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  • Local Area Networks (LANs)

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    • Hardware Addressing
    • Ethernet, WLAN and Bluetooth
    • Extending LANs: Fiber Modems, Repeaters, Bridges, Switches

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Part 2: Packet Transmission (Cont’d)

  • WAN Technologies and Routing

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  • Network Ownership and Service Paradigm

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  • Protocols and Layering

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Part 3: Interntworking

  • Concepts, Architecture and Protocols

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  • IP Addresses

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  • Binding Protocol Addresses

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Part 3: Interntworking (Cont’d)

  • IP Datagrams and Datagram Forwarding

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  • IP Encapsulation, Fragmentation and Reassembly

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  • TCP/IP

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Part 4: Network Applications

  • Client-Server Interaction

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  • The Socket Interface

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  • Example Applications

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Grade Distribution

  • Assignments 15%

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  • Midterm Examination 35%

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  • GMDB 5%

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  • Final Examination 45%

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COURSE INTRODUCTION

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CHAPTER No. 1�INTRODUCTION

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Network and Internet

  • Network

System for connecting computers using a single transmission technology

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  • Internet

Set of networks connected by routers that are configured to pass traffic among any computers attached to any network in the set

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Classification of Networks

  • By SIZE
    • Local Area Network (LAN) versus

Wide Area Network (WAN)

  • By Connectivity
    • Point-to-Point versus Broadcast
  • By Communication Medium
  • By Mobility
    • Fixed versus Mobile

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Networks in Daily Life

  • Now, networks are an important part of everyday activities

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    • Business
    • Home
    • Government
    • Education

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Mastering The Complexity

  • Concentrate on understanding the concepts

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  • Learning the Networking Terminology

(summarized in a Glossary in Appendix 1)

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Complexity in Network Systems�

  • Many different technologies exist

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  • No single underlying theory or model

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  • Models are either so simplistic or so complex

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  • No simple or uniform terminology