GCSE Computing - Wired and Wireless Networks

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  • Wired and Wireless Networks
    • Benefits of Networking
      • Work can be shared out between the nodes.
      • Sharing of files.
      • Monitoring of user activity.
      • Centralised administration and updates.
      • Control of access and other security related features
    • The Internet
      • The internet is the connection of computers using lots of different technologies.
      • Lots of technologies run on this network, such as: email, online gaming and the WWW.
    • Network Classifications
      • PAN - Personal Area Network
        • Range is usually 10m
        • Devices usually include: laptops, a mouse and cameras
      • LAN - Local Area Network
        • Connects nodes inside a building or a small site.
        • Examples include: a school and office building
      • WAN - Wide Area Network
        • Connects several LANs to ensure that groups of computers can connect.
        • Examples include: the Internet and JANET
      • SAN - Storage Area Network
      • VPN - Virtual Private Network
    • Network Types
      • Client - Server
        • Expensive to setup.
        • Expensive to maintain.
        • Powerful server is needed.
        • Network software is needed.
        • Systems administrator is needed to manage the system.
        • A systems administrator is needed to manage the system.
        • Computers that carry out a specialised task on the network are called servers.
        • Computers which the users work on are called clients.
      • Peer to Peer
        • Nodes are connected to each other without one computer having superiority over others.
        • When a file is allowed to be shared it can be accessed by all other computers
        • Each computer carries out the tasks of the client and the server.
    • Transmission Media
      • UTP
        • Most LANs are connected using copper wire.
        • UTP is made from copper wire twisted round each other to minimise induction.
      • Fibre
        • These are very expensive to have as they are made out of glass.
        • These cables can't bend around corners.
      • Wireless
        • Wireless allows devices to be connected to a network wireless.
        • Security is an issue as signals are easier to intercept.
    • IEEE
      • This is the institute of Electrical and Electronics Engineers.
      • This organisation oversees standards for electronics in order to promote good practice.
    • Devices
      • Routers
        • This device sends packets between networks.
        • In home networks, they connect individual nodes to the internet.
      • Hub
        • Hubs are a way to connect devices to a LAN.
        • Hubs receive the network signal and broadcast it to all connected devices.
      • Switch
        • This device connects nodes together.
        • They send packets of data to the intended destination only.
      • WAP
        • This is a point at which a network enables device can access the network.
        • It usually connects to a router.
    • Factors Affecting Network Performance
      • Bandwidth - The higher this is, the faster the data can be transferred.
      • Latency - This is the speed it takes for packets to travel.
      • Errors in transmission - The noise on the network may increase packet collisions.
    • The DNS
      • This is like a directory for websites.
    • Hosting
      • A host is a computer that can be accessed by remote users.
    • The Cloud
      • Cloud storage is off-site, third party storage where users store their data.
      • This is accessed through an internet browser.

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