Networks

Networks

1. LAN (Local Area Network)

   • Suitable for smaller areas such as single compaines
     • School network is LAN

2. WAN (Wide Area Network)

   • Used in very large areas in many different organisations.
     • The World Wide Web is an example of a WAN

3. Network Topologies

   • Ring network
     • All networked computers are connected together in a circle
       • This is fast because all data travels one way down the cable
       • If one cable breaks, all the computers will not work
   • Bus networks
     • All computers are connected to one big cable called the backbone
       • Cheap and easy to install
       • If the backbone breaks the whole network is unavailable
       • Not suitable for large LAN's becuase it can slow down computers
   • Star network
     • All computers are cnnected directly to a server using hubs or switches
       • If one cable breaks, all of the other cables will still work
       • This is fast because each computer has its own line to the server
       • It is expensive to buy the hardware

4. Services

   • Internet
     • A global computer network providing a variety of information and communication facilities, consisting of interconnected networks using standardized communication protocols.
   • Intranet
     • A local or restricted communications network, especially a private network created using World Wide Web software.
   • Extranet
     • An intranet that can be partially accessed by authorized outside users, enabling businesses to exchange information over the Internet in a secure way.