Network

Network

1. Disadvantages

   • networks are vulnerable to viruses and hackers
   • can be very hard to set up
   • Networks are expensive to set up

2. Types of networks

   • LAN
     • A network in a small area or single Organisation
   • WAN
     • A network that spans a large area of multiple orginization

3. Advantages

   • Makes it much easier to share files and resources
   • You can access your account from any computer connected to network

4. Topologies

   • bus
     • Lots of computers set up in a line that is all connected to one main wire
       • Cheap
       • High chance of collisions
       • high chance of catastrophic
       • slow down as more computers are added
   • Ring
     • lots of computers make a ring formation
       • cheap
       • no collisions
       • High chance of catastrophic
       • difficult to add more
   • star
     • main switch in the centre with all the other computers connected to it
       • fast
       • easy to add more
       • Expensive
       • Failure on the switch will shut down

5. IP Address

   • Definition
     • IP Addresses are unique values assigned to every computer/device on a network, used to identify it.
   • How many IP Addresses are there?
     • 4,228,250,625
   • What is it for
     • so messages can go to the right IP Address
   • What dose one look like
     • 86. 149. 217. 255

6. Internet

   • What kind of topology?
     • Description
   • How are large files set
   • How are routes between nodes chose