Wired And Wireless Networks

Wired And Wireless Networks

1. Wide Area Network

   • A wan uses cables, telephone lines, satellites and radio waves to connect usually over a large area
   • a network in which computers communicate using resources supplied by a third party carrier
   • The Internet is a Wan
   • Use telephone cables and satalites
   • Usually Spread Over A Large Geographical Area

2. The Internet

   • The Internet is made up of inter-connected networks
   • In 2012 2.1 Billion peope where connected to the internet
   • All conneced devices have a unique adress called an IP just like everyone in h=the real world has a house dress
   • Your IP adress can change it is not your specific computer it is the internhet you are connected too

3. Packet Switching

   • Each file sent is broken into smal packets
     • Makes it uch easieir to send things at a fast ace
     • The packets are sent to a node or a router then to the reciver
   • Packets are labelled woth the recivers IP Dress
   • Man packets are sent acroos different routes to get to the destination as fast as possible

4. DNS

   • This process is transferring an iP adress to a name for an example say and ip is 17.56.87 dns changes it to a name for example google.co.uk

5. Topologies

   • Star
     • 1 Advantage of a star network is really fast and if cable were to break the hole server wouldnt go down
     • Cabling to run the whole system is very expensive
   • Bus
     • It is very slow as it has to pass threw all clients on the server
     • It is very cheap to run
   • Mesh
     • A lot of cableing involved to make them all connected together
     • You dont need to get a server

6. Protocols

   • A set of rules

7. LAN