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CSCI 4550/8556 Computer Networks

CSCI 4550/8556 Computer Networks. Comer, Chapter 1: Introduction. How do computer networks and internets operate?. Network: a system for connecting computers using a single transmission technology

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CSCI 4550/8556 Computer Networks

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  1. CSCI 4550/8556Computer Networks Comer, Chapter 1: Introduction

  2. How do computer networks and internets operate? • Network: a system for connecting computers using a single transmission technology • Internet: a set of networks connected by routers that are configured to pass traffic among any computers attached to networks in the set • Data transmission - network media and data encoding • Packet transmission – data exchange over a network • Internetworking – universal service over a collection of networks • Network applications – programs that use an internet

  3. Explosive Growth • New phenomenon - now, networks are an important part of everyday activities: • Business • Home • Government • Education • The global Internet is growing exponentially: • Initially, a research project with a few dozen sites • Today, millions of computers and thousands of networks world-wide

  4. Internet • Has its roots in the military network called Arpanet • Fundamental changes from centralized to distributed computing • Incorporated features for reliability and robustness • Multiple links • Distributed routing • Ethernet made local networking feasible • TCP/IP protocol made internetworking possible • Developed after Arpanet • Switchover occurred in 1983 • Exponential growth - doubling every 18 months

  5. Economic Impact • A large industry has grown around: • Networking hardware • Computers • Software • Companies must integrate the planning, implementation, management and upgrade of their networks

  6. Complexity • Computer networking is complex: • Many different hardware technologies • Many different software technologies • All can be interconnected in an internet • No underlying theory • Terminology can be confusing • TLAs • Industry redefines or changes terminology from academia • New terms invented all the time

  7. Abstractions and Concepts • We will concentrate on abstractions and concepts to unravel complexity • Examples: • The types of LAN wiring, rather than the details of LAN data transmission • The definition and concept of congestion, rather than specific congestion control mechanisms

  8. On-line Resources • Glossary search • Textbook table of contents • Textbook index • Website materials

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