Networks Revision

Networks Revision

1. Advantages

   • it is a quick, easy way to communicate
   • files are available from every computer in the network
   • it also saves time when accessing files

2. Disadvantages

   • if one computer gets a virus, then all of them can get it.
   • it is very axpensive as you need loads of wires and alot of power
   • networks need experts to run it, which can cost alot of money to employ

3. Types of network

   • a LAN network means a networkwhich is very local ( in the same building or very close by)
   • a WAN network is a wide network which can be used when participents are quite far away from each other

4. Topologies

   • Bus Topology
     • Advantages
       • cheap and easy to run because it only runs on one cable
       • easy to add to ( more computers)
     • Disadvantages
       • If one wire breaks, everything breaks
       • easy to create data collisions
   • Ring Topology
     • Advantages
       • reduced chance of collisions
       • one cable per computer
     • Disadvantages
       • Hard to add a new computer
       • High chance of catastrophic failure
   • Star Topology
     • Advantages
       • Low chance of catastrophic failure
       • Easy to add new computers
       • Fast, low chance of collisions
     • Disadvantages
       • Expensive with loads of wires
       • Failure of switch will shut down everything
     • Shaped like a star
   • IP Adresses
     • An IP address is a location of a computer
       • Every computers IP address is UNIQUE
     • everyone can see your public ip address
       • A PRIVATE IP, only you or hackers can see this
     • The Internet is a WAN
     • Messages have IP addresses attatched