Networks

Networks

1. Introduction

   • Protocols are a set of instructions that control how data is shared in networks
   • Advantages of Networks
     • Easy communication
     • Easily accessible
     • Easy to share information
     • Easy to share resources
     • Easy to stream software using web applications
   • Disadvantages of Networks
     • Dependence
     • Hacking
     • A lot of hardware is required
     • Viruses

2. LANs and WANs

   • LAN - Local Area Network
     • A network of computers in the same building
   • WAN - Wide Area Network
     • Created when LANs are connected requiring broadband cables
   • VPN - Virtual Private Network. Hosted securely on another network
   • WPAN - Wireless Personal area Nework. Allows individual devices to connect to networks

3. Topologies

   • Bus Network
     • All workstations, servers and printers are joined to one cable
     • Easy/cheap to install
     • If main cable fails whole network fails
     • As more workstations are added performance becomes slower
   • Star Network
     • Each device has its own cable that connects to a switch or hub
     • Very reliable
       • High performing
     • Expensive (because of cables+extra hardware)
       • If a hub/switch fails all devices connected to that will have no network connection

4. Wired/Wireless

   • Wired - through ethernet cables
   • Wirelss
     • Needs a network interface card
     • Uses radio signals to send data
       • Wireless adapter converts data into radio signals
     • Need a MAC adress
     • Advantages
       • Cheap set-up
       • not tied to specific location
       • Conect multiple devices without extra hardware
     • Disadvantages
       • interference can occur
       • more open to hacking
       • it will lose quality through walls or obstructions
       • slower than wired networks

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