Wide Area and Metropolitan Area Networks

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Chapter 8

• Wide Area and Metropolitan Area Networks

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Learning Objectives

• Describe the topologies used in wide area
  networks and metropolitan area networks
• Explain the use of IBMs System Network
  Architecture and how it relates to todays
  communication environments
• Define System Application Architecture and how it
  is used in a wide area network

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Learning Objectives

• Describe the use of Digital Network Architecture
  (DNA)
• Illustrate the differences among the layered
  architectures of SNA, SAA, DNA and the OSI model
• Explain the concepts of electronic commerce and
  business-to-business initiatives

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Learning Objectives

• Explain how electronic data interchange (EDI)
  uses wide area networks
• Describe the use of metropolitan area networks in
  the corporate environment

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Introduction

• Wide area networks connect remote devices
• Global networks are becoming more important
• Metropolitan area networks connect servers and
  clients in an area the size of a large city

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Network Connections

• Point-to-Point Connections
• Local connection between server and client

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Network Connections

• Point-to-Point Connections
• Local connection between server and client
• Client and remote server

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Network Connections

• Point-to-Point Connections
• Local connection between server and client
• Client and remote server
• Computer to computer (server to server)

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Network Connections

• Point-to-Point Connections
• Local connection between server and client
• Client and remote server
• Computer to computer
• Multipoint Connections
• Modem and/or concentrator used

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Network Connections

• Point-to-Point Connections
• Local connection between server and client
• Client and remote server
• Computer to computer
• Multipoint Connections
• Modem and/or concentrator used
• Less costly than point-to-point

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Topologies

• Wide Area Networks
• Hierarchical Networks

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Topologies

• Wide Area Networks
• Hierarchical Networks
• Star Networks

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Topologies

• Wide Area Networks
• Hierarchical Networks
• Star Networks
• Ring Networks

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Topologies

• Metropolitan Area Networks
• Bus

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Topologies

• Metropolitan Area Networks
• Bus
• Ring

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Systems Network Architecture

• IBM product initially used for mainframe-to-mainfr
  ame connections
• Now used more extensively for many types of
  network connectivity

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Systems Network Architecture

• Advanced Program-to-Program Communication (APPC)
• Allows peer-to-peer communication between
  programs
• Also known as LU 6.2

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Systems Application Architecture

• Set of standards that defines a common set of
  user interfaces and communications systems for
  many types of IBM computers

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Systems Application Architecture

• Common User Access
• Common Programming Interface
• Common Communication Support
• The SAA Layered Model

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Digital Network Architecture

• DECnet Support

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Digital Network Architecture

• DECnet Support
• DNA Structured Model

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Digital Network Architecture

• DECnet Support
• DNA Structured Model
• EnVISN Architecture

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Electronic Commerce

• e-Commerce removes traditional boundaries
• Secure servers
• Business-to-business e-commerce is much larger
  than business-to-consumer e-commerce

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Data Warehousing

• Practice of keeping historical data available for
  easy access
• Data mining
• Used when fast access to vast quantities of data
  is extremely important

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Business-to-Business (B2B) Initiatives

• Supplier/Consumer relationships
• Alliances with competitors
• Use of extranet to share information

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Electronic Data Interchange

• Exchange of documents by direct
  computer-to-computer connection

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Electronic Data Interchange

• Exchange of documents by direct
  computer-to-computer connection
• Without EDI, more manual intervention is
  required, which slows processing time

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Electronic Data Interchange

• Components of EDI

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Electronic Data Interchange

• Components of EDI
• EDI Standards
• ANSI X.12

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Electronic Data Interchange

• Components of EDI
• EDI Standards
• ANSI X.12
• Advantages of EDI

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Metropolitan Area Network Implementations

• MAN Layered Architecture

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Metropolitan Area Network Implementations

• MAN Layered Architecture
• Municipal MAN

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Metropolitan Area Network Implementations

• MAN Layered Architecture
• Municipal MAN
• School District MAN

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Summary

• WANs used to connect computers, terminals, LANs
• Point-to-point versus multipoint connections
• Topologies
• SNA designed for WANs by IBM
• DNA is Digital Equipments layered architecture

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Summary

• Electronic commerce is growing rapidly
• Data warehousing allows easy access to large
  amounts of data
• EDI connects suppliers and customers via WANs
• Metropolitan area networks bridge the gap between
  WANs and LANs

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EndChapter 8