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.




Thanks for the details!



Excellent visualization. It's especially useful for me as I'm trying to understand how PIA works. I'm going to install it for my Firestick, already found the instructions on https://www.firesticktricks.com/install-private-internet-access-on-firestick.html, but need to figure out how it works.

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