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Network Overview (PowerPoint)


									Network Overview

Network Operating Systems
           What is a Network?
• Network - definition
  Group of interconnected computers (devices)
  sharing services, resources and a common
  communications link.
• So, what does that mean?
 • Computers / Devices
    Workstations (uses resources from server)
    Servers (provides resources and/or security)
    Communication Devices - Routers, Hubs,
    Modems, etc. (gets data from “here to there”)
    Service Devices - Printers, Fax, CD Towers, Tape
    Backup, etc.
   What is a Network (cont.)
• Services
   E-mail
   Time management - Daytimer, Room Schedules
   Video / Telephone Conferencing

• Resources
   Disk Space
   Large Files (Databases, Graphics, etc.)
   Costly devices - Color Laser Printers, etc.
   Applications
     What is a Network (cont.)
• Common Communications Link
  Wire based cable – STP, UTP, Coax
  Fiber optic
  Wireless - Radio, IR, Microwave, etc.

• Types of Networks
  Centralized
  Decentralized
  Collaborative or Cooperative
         Types of Networks
• Centralized
  One central computer did all of the processing
  User interacts at the system console or remote
  Example - Mainframe systems
• Distributed (Decentralized)
  PCs can process and store data at the users desk
  Customize each PC for the user
  Free up time on the “Big Boxes” for larger tasks
     Types of Networks (cont.)
• Collaborative / Cooperative
 Share processing power between devices

 One system may run processes on another
 systems CPU.
 Some processes may be designed to run on more
 than one system at the same time.
             Network Models
• Peer-to-Peer
  Every computer is a workstation
  Every computer may be a server
  User is responsible for administering the shared
  resources on their system (“distributed” or
  “workgroup” administration)
  Very cost efficient for small companies or offices
  with limited resources and where security is not a
  big factor on the network
        Network Models (cont.)
• Client / Server
  “Dedicated” servers provide resources and security
  Servers provide a single place for security and
  resource management
  Workstations utilize these resources within the
  security structure

  Workstations can have minimal configurations
  therefore holding system cost down
      Network Shapes and Sizes
• LAN - Local Area Network
  Within the “4 walls” of a building or campus
  Shorter transmission distance usually means higher
  Typically wire or fiber optic medium
  Less expensive technology
  Relatively error free and “no cost” transmission
        Shapes and Sizes (cont.)
• MAN - Metropolitan Area Network
  Interconnect multiple LANs within the “city” limits
  Maintains high speed transmission
  Moderately expensive technology
  Relatively error free and “low cost” transmission
       Shapes and Sizes (cont.)
• WAN - Wide Area Network
  Interconnect multiple LANs and MANs
  Unlimited geographical area (anywhere in the
  Transmission speed and cost VERY dependent on
  Much more sophisticated and complex than LANs
  or MANs
  More susceptible to errors due to transmission
  distance and media

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