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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 l.jpg

Networking Fundamentals

Week 6

COMPUTER PLATFORMS

Stuart Cunningham - Computer Platforms - 2003


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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


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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


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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


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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


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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


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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


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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


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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


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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


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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


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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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