Networks - Greg Medd

Networks - Greg Medd

1. Ring

   • + - easy to add extra devices and each computer has the same amount of access
   • - - if there is a break the whole network fails impossible to keep running while adding hardware

2. Bus

   • + - cost effective as only a small amount of cable is used - easy to add extra devices
   • all devices are connected to a backbone
     • signals are passed along the backbone in either direction

3. Star

   • + - fault tolerant - easy to add extras - if one fails others can still be used
     • - - expensive - dependence on the server

4. LANS and WANs

   • LANs
     • confined to a small area
       • cheap to build
         • cheap to run
   • WANs
     • cover a wide geographical area
       • in lots of different bildings
         • use expensive telecommunication links supplied by telecom companies
           • expensive to build
             • expensive to run

5. Intranets and Extranets

   • intranets
     • private networks
       • use the same technology as the internet
         • used to send data around a network
           • useful for organisations
   • Extranets
     • like an intranet but allows other parties such as customer to enter

6. a network is two or more computers that are linked together to share resources

   • shared resources include:
     • hardware
     • software
     • data
     • an internet connection

7. peer to peer network

   • each computer has equal status
     • all computers share the resources
       • only suitable for small/home networks
         • basic knowledge needed
           • if more people use the network it slows down

8. client - server networks

   • one powerful computer (server) is used to store the data. it is in control of the server
     • programs are stored on the server and the other computers access them from there
       • network is dependent of the server
         • if the server goes down the network fails

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