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Networking Fundamentals Week 6. COMPUTER PLATFORMS. Week 5. What is a network? What does the network do? Why network? Common network types Network architecture Client/Server Peer-to-peer Network Components. What’s a network?. Technology used in communication systems:

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computer platforms

Networking Fundamentals

Week 6

COMPUTER PLATFORMS

Stuart Cunningham - Computer Platforms - 2003

week 5
Week 5
  • What is a network?
  • What does the network do?
  • Why network?
  • Common network types
  • Network architecture
    • Client/Server
    • Peer-to-peer
  • Network Components

Stuart Cunningham - Computer Platforms - 2003

what s a network
What’s a network?
  • Technology used in communication systems:
    • Telecommunications
    • Digital Broadcasting
    • Data Communications
  • It is:
    • Mobile phones, telephones
    • Computer networks, the Internet
    • Facsimile (FAX)
    • TV and Radio

Stuart Cunningham - Computer Platforms - 2003

what s a network4
What’s a network?
  • A collection of systems / resources which are all connected together via a medium
    • Cables
      • Lots of different types
      • E.g.- Public telephone network
    • Wireless
      • Different frequency ranges
      • E.g.- Mobile phone networks
  • The medium is used to send signals between two communication point
  • Computer data is translated into signals to be sent / received over a medium

Stuart Cunningham - Computer Platforms - 2003

what does the network do
What does the network do?
  • Allows people in remote locations to ‘talk’ with each other
    • Or at least, allows their computers or communication equipment to ‘talk’
  • Promotes the sharing of:
    • data
    • resources
    • ideas
    • media (e.g.- images, audio, video)

Stuart Cunningham - Computer Platforms - 2003

why network
Why network?
  • In the office
    • The Internet
      • Email, web, FTP, e-business, etc.
    • Sharing of local information
    • Communications
    • Sharing resources
      • Printers, scanners, plotters, etc.
  • At home
    • The Internet
      • Email, web, FTP, P2P sharing, news, etc.
    • Sharing resources
      • Printers, scanners, etc.
    • Ease of communication for more than one PC

Stuart Cunningham - Computer Platforms - 2003

common network types
Common Network Types
  • LAN (Local Area Network)
    • Connect together computers in the same room or building
      • E.g.- NEWI Network
  • WAN (Wide Area Network)
    • Connects together computers of large geographical or geological areas
      • E.g.- The Internet, JANET
  • MAN (Metropolitan Area Network)
    • Connects together buildings or sites over city / town sized areas
      • 2 – 6 Km apart

Stuart Cunningham - Computer Platforms - 2003

computer network architecture
Computer Network Architecture
  • Client / Server
    • Centralised Control / Administration
      • The SERVER(s)
        • They provide a ‘service’ or ‘services’ to users
        • Will almost always control the network
        • Could provide email, file sharing, web services, etc, to users
      • CLIENTS
        • These could be computers or dumb terminals
        • Connect to the server which provides information or services
        • Are controlled and administered by the server
    • If server has a fault this affects the clients connected
    • Common in business

Stuart Cunningham - Computer Platforms - 2003

computer network architecture9
Computer Network Architecture
  • Peer-to-peer
    • “Everybody’s Equal”
    • Essentially allows users to both send and retrieve files from each other’s computers
      • Like having a Client and Server on each machine
    • On the Internet this often refers to file sharing applications
      • Such as Napster, AudioGalaxy, Gnutella, etc.
    • Lacks any central control
      • Can compromise security
    • Used in small businesses and at home

Stuart Cunningham - Computer Platforms - 2003

network components
Network Components
  • Node
    • ‘Terminal’
    • ‘Computer’
    • A device connected to the network
  • Network Interface
    • Connects the node to the physical network
    • Network Interface Card (NIC) on LANs
    • MODulator / DEModulator (MODEM)
  • Hub
    • Sometimes called a ‘concentrator’
    • A central point where network connections from nodes meet
    • Depends on topology

Stuart Cunningham - Computer Platforms - 2003

network components11
Network Components
  • Media
    • The object over which a signal is transmitted or received
    • The thing which interconnects two or more points
      • Cables and wires
        • Coaxial cable
        • Twisted pair cable
        • Fibre optic cable
      • Wireless
        • Microwave
        • Satellite
        • Infrared

Stuart Cunningham - Computer Platforms - 2003

week 5 what do you know
Week 5 – What do you know?
  • What a network is
  • What a network does
    • Communication
    • Sharing of resources
  • Common network types
    • LAN, WAN, MAN
  • Network architecture
    • Peer-to-peer
    • Client/Server
  • Network Components
    • Nodes
    • Network Interfaces
    • Hubs
    • Media

Stuart Cunningham - Computer Platforms - 2003

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