Networks

Networks

1. Disadvantages

   • Lost: Networks are expensive to set up
     • Increased risk: problems such as as viruses can affect every computer on the network
     • Difficulty: expertise is needed to set up and maintain a network

2. Advantages

   • Share files so the same files are available in every computer you use
   • share resources such as printers and internet connection
   • share logins so the same username and password can be used on every computer on the network

3. LAN- Local Area Network

   • WAN- Wide Area Network
     • A network that spans over a large area or multiple organisations.
   • A network in a small area or single organisations

4. topology

   • bus
     • the network consist of a single cable that runs though a network
   • star
     • circle
       • computers that are connected to each other by a ring
     • all computers are connected to a central switch

5. IP address

   • An IP Address is a unique value assigned to every computer on a network, used to identify it
   • When the format of IP Addresses were decided in 1983, 4 billion addresses seemed more than enough
     • When a computer is added to a network it is assigned an IP Address (Internet Protocol Address)

6. The Internet

   • The Internet is a world-wide network Devices on the Internet need IP Addresses, just like any other network
   • We get round this by assigning an “external” IP address to each house or business, then “internal” IP addresses to the computers in that house or business