commtech[3] - IS 3413 Introduction to Telecommunications...

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IS 3413 – Introduction to Telecommunications for Business Instructor: Yoris A. Au, Ph.D. Internetworking Slide Set #1 1
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2 Chapter 20 Internetworking: Concepts, Architecture, and Protocols
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3 Topics Covered 20.1 Introduction 20.2 The Motivation for Internetworking 20.3 The Concept of Universal Service 20.4 Universal Service in a Heterogeneous World 20.5 Internetworking 20.6 Physical Network Connection with Routers 20.7 Internet Architecture 20.8 Achieving Universal Service 20.9 A Virtual Network 20.10 Protocols for Internetworking 20.11 Review of TCP/IP Layering 20.12 Host Computers, Routers, and Protocol Layers
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4 20.1 Introduction This chapter discusses the motivation for internetworking introduces the hardware components used describes the architecture in which the components are connected discusses the significance of the concept
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5 20.2 The Motivation for Internetworking Each network technology is designed to fit a specific set of constraints LAN technologies are designed to provide high-speed communication across short distances WAN technologies are designed to provide communication across large areas No single networking technology is best for all needs! A large organization with diverse networking requirements needs multiple physical networks If the organization chooses the type of network that is best for each task, the organization will have several types of networks For example, a LAN technology like Ethernet might be the best solution for connecting computers at a given site but a leased data circuit might be used to interconnect a site in one city with a site in another
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6 20.3 The Concept of Universal Service Most modern computer communication systems allow communication between any two computers analogous to the way a telephone system provides communication between any two telephones, known as universal service With universal service a user on any computer in any organization can send messages or data to any other user
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7 20.3 The Concept of Universal Service The chief problem with multiple networks is obvious: A computer attached to a given network can only communicate with other computers attached to the same network The problem became evident in the 1970s as large organizations began to acquire multiple networks Each network in the organization formed an island In many early installations each computer attached to a single network and employees had to choose a computer appropriate for each task an employee was given access to multiple screens and keyboards the employee was forced to move from one computer to another to send a message across the appropriate network Users are neither satisfied nor productive when they must use a separate computer for each network
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8 20.4 Universal Service in a Heterogeneous World Does universal service mean that everyone needs to adopt a single network technology? or is it possible to have universal service across multiple networks
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This note was uploaded on 01/26/2012 for the course IS 3413 taught by Professor Staff during the Fall '08 term at The University of Texas at San Antonio- San Antonio.

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commtech[3] - IS 3413 Introduction to Telecommunications...

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