Network

Network

1. Internet

   • a group of interconnected networks
   • World Wide Web
     • a library of info
     • collection of web pages
     • stored on computers all over the world
   • URL
     • a web address
       • .gov
       • .org
       • .com
       • .edu
       • .co.uk
     • all are unique

2. lots of computers linked together

   • for communication
   • sharing

3. Connectivity

   • Bandwidth
     • amount of data that can be carried at a time
     • network bandwidth, data bandwidth, digital bandwidth
   • Connection Speed
     • the speed data transfers between a device and the internet
     • Upload speed
       • the rate that information travels
     • Download Speed
       • the rate that information travels from the internet to a device
   • Deep Sea Cables
     • History
       • first communications cable was completed in the summer of 1858, running between Ireland and Newfoundland
     • placed close to shore and shallow areas
     • most connections are in North America and Europe
   • Bandwidth
     • the amount of data that can be transmitted in a fixed amount of time
       • in bits per second (bps)
     • high speed connection between devices
   • types of cables
     • fibre optic
       • travel at speed of light
       • made of fine strands of glass
       • expensive
     • copper
       • twisted pair
         • made of two copper wires twisted around each other
         • cheap
         • fast
         • easily interfered
       • coaxial
         • central cable that transmits data is surrounded by a shield of copper braiding which protect cable from interference
         • more expensive than twisted pair
   • Wireless
     • cheap
     • less hastle
     • less secure
     • easily intefered
     • no cables
     • slower
   • Buffering
     • Preloading data into a reserved area of memory

Imagens e arquivos do mapa