networks (the basics)

networks (the basics)

1. what is a computer network

   • a newtwork is two or more computer that are linked together so that they are able to share resources

2. shared resources

   • hardware
     • printers
     • scanners
       • storage
   • software
     • needs to only be installed on one computer
   • data
     • database files
   • internet connection

3. peer to peer network

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

4. client-server networks

   • one or more powerful computers called the server is used to store the data for the network this computer is in control
     • totally dependant on the server

5. Local area network (LAN)

   • confined to a small area
     • normally located in a single building
     • use cable,wireless,infared and microwave links that are generally owned by the organization
     • cheap to build and run

6. wide area network

   • covers wide geographical area
   • lots of different buildings and cities
   • expensive to build and run

7. topolioges

   • ring
     • +easy to add extra devices
     • +each computer has the same access so no one can hog
     • - a break the whole network breaks
     • difficult to locate faults
   • BUS
     • all devices connected to the "backbone"
     • signals passed in either direction along the cable
     • cost effective
     • easy to install
   • STAR
     • +fault torrent
     • load torrent
     • easy to add extras
     • -higher cost
       • _depenedance on router

8. INTRANET

   • PRIVATE NETWORK THAAT USES THE SAME TECHNOLOGY AS THE INTERNET USED TO SEND DATA AROUND A NETWORK
   • EXTRANET
     • LIKE AN INTANET BUT ALLOWS OTHER PARTIES SUCH AS CUSTOMERS

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