Networks

Networks

1. Types of Topologys

   • Bus Topology
     • Advantages
       • Cheap to install
     • Disadvantages
       • Slows down as more computers are added
       • Lots of collisions
       • High Chance of Catastrophic failure
   • Ring Topology
     • Advantages
       • Cheap to Install
       • No Collisions
     • Disadvantages
       • High chance of catastrophic failure
       • Difficult to expand
   • Star Topology
     • Disadvantages
       • Expensive
       • Depends on a switch
     • Advantages
       • No Collisions
       • Low chance of Failure

2. Types of Networks

   • WAN
     • Wide Area Network. A Network that spans a large geographical area, or multiple organisations
   • LAN
     • Local Area Network. Is a Network contained in a single geographical location or organisation

3. A Network. This is a group of computers connected together so that they can communicate.

4. IP Addresses

   • An IP Address is a unique value assigned to every computer on a network, used to identify it.
   • Businesses use their own IP Addresses because if the internet runs out of IP Address then you cannot add anymore computers to your business

5. Disadvantages of Networks

   • Networks can run out of IP Addresses.

6. Advantages

   • The computers are all connected to one Network so you can log onto any computer
   • You can share platforms files and printers.

7. The Internet

   • Routing
     • Data has to choose a route. In order to do this, each node continually tests its connections and assigns them a “cost”, a lower cost means faster connection.
   • Packets
     • Large amounts of Data travels around the whole internet. All data on the Internet is split up into small chunks called packets
   • Mesh Topology
     • Instead of using a Ring, Star or Bus Topology, the Internet uses a mesh Topology. This means that if a route is cut off then another route can be found.