Networks

Networks

1. Advantages

   • Software can be shared
   • Devices can be shared
   • Data and files can be shared
   • Networked computers can comunicate
   • They can be controlled by a network manager
   • easier back up for all devices

2. Disadvantages

   • Cost of cables can be high
   • Viruses can be easily spread
   • Hackers can access all files
   • Networks can fail causing loss of data

3. File server

   • A computer on a network that can hold files that can be used by other computeter on the network

4. Client-server network

   • Has one computer acting like a file server

5. Peer to peer network

   • All computers are of equal importance

6. Network topologys

   • Bus
     • Advantages
       • Cheap to set up
       • If a computer fails the network works
     • Disadvantages
       • Speed of data is slow
       • If the network cable breaks then it all goes down
   • Star
     • advantages
       • If a cable or computer breaks all others can still access files
       • Direct access to file server so its fast
     • disadvantages
       • Exepnsive due to cable needs
       • If the file server fails all goes down
   • Ring
     • Advantges
       • Cheap to set up
       • Data has no collisions
     • Disadvantges
       • If any computer or server breaks it all goes down

7. Nets

   • Intranet
     • Similar services to the internet but only available to one network
   • extranet
     • Part of the intranet that can be acessed by the public
   • world wide web
     • collection of multimedia info for the internet

8. Prevention from

   • hackers
     • passwords
     • fire walls
     • acess rights
   • virus
     • Anitvirus software
     • Firewall software

9. Components

   • Switch
     • A device that filters data pakcets and forwards them between segments of the network
   • network interface card
     • Computer hardware that is generally inside the computer and allows devices to connect to a wired network
   • Gateway
     • System that connects a LAN to a WAN
   • router
     • Device that forwards data packets across a network. they determine the best pathway for data by communiction with other routers
   • Bridge
     • Connects a lan to a lan