Networks

Networks

1. LAN

   • Local Area Network
     • Network confined to one location
     • Resources only available to computers on that LAN

2. WAN

   • Wide Area Network
     • Network spanning across large geographical locations
     • Resources accessible to devices on the WAN

3. Topologies

   • Bus Topology
   • Ring Topology
   • Star Topology
   • Mesh Topology

4. Advantages

   • Easier to share files and resources amongst networks - can be useful in offices and work environments
   • Single username and password for every computer in the system

5. Disadvantages

   • Expensive hardware needed to set up
   • Difficult to maintain so requires technical expertise

6. Hardware

   • HUB / Switch
     • A hub routes packets round a network by blindly sending them to every device in the network
     • A switch routes packets round a network by analysing them and sending them to the device they are adressed to
   • Bridge / Gateway
     • A bridge connects together two networks that use the same base protocols
     • A gateway connects together two networks that use different base protocols
   • Router
     • A router stores the address of computers on its network and transfers their data on other networks
   • WAP / NIC
     • A wireless access point is a device that creates a wireless network and allows other devices to connect
     • A network interface card is a device that joins the network and connects to a computer other device

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