Networks

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  • Created by: millard
  • Created on: 10-05-16 16:38
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  • Networks
    • LAN vs Standalone PC
      • LAN ADV: hardware can be shared;    data can be backed up; can share files
      • LAN DISADV: expensive hardware;  hackers can gain access to your computer;   virus' and malware is easier to pick up
    • Topologies
      • Ring
        • The each device is connected to two other nodes, the data flows one way
      • Bus
        • All nodes are connected to a (usually) fibre optic backbone; which the data flows through
      • Star
        • All nodes are connected to a central server, which the data travels through before being sent to the correct node
    • Hardware needed
      • Cat 5, ethernet
      • Fibre optic
      • Hub
        • Sends the data to all nodes
      • Switch
        • Send the data to the correct node on the network, it does this by storing the MAC address of each node
      • MoDem
        • Modulator Demodulator, turns the digital signal from the computer into an analogue signal before sending it down a cable
      • Router
        • Connects nodes in a building together and is needed to connect a LAN to a WAN
    • Roles of computers in networks:
      • Peer-to-Peer
        • All users share the same user access level, data is stored on individual machines
      • Client-server
        • All of the nodes are connected to a central server which backups data and controls the flow of data

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