Networks

Networks

1. internet

   • world wide web
     • parts of a web address
       • www.abc.co.uk/images/logo.jpg
         • www.
           • hosted on the world wide web
         • abc
           • name of the organisation
         • .co
           • a company
         • .uk
           • based in the uk
         • /images
           • folder location
         • /logo.jpg
           • filename on the site
     • url
       • uniform resource locator
     • Collection of web pages
     • stored on computers all over the world
     • accessed via the internet
     • no owner
     • no central storage
     • domain names
       • tld
         • top level domains
           • .uk
           • .fr
           • .com
           • .com
           • .es
           • .de
           • .org
           • .gov
           • .edu
           • .biz
   • http
     • hyper text transfer protocol
       • protocol is a set of rules
       • defines rules web browsers and servers use to share information
   • upload speed
     • the speed at which you can upload something
       • usually slower than download speed, possibly not in schools
   • streaming
     • transmits data e.g. photos, videos, music in a continuous data stream or flow so the watcher/listener can start watching immiedately

2. a group of connected computers

3. connectivity

   • download speed
     • how fast you can download something
     • usually faster than upload speed as people mostly download and not upload
   • bandwidth
     • the maximum amount of data that can be transferred in a given time
     • connection speed
       • speed data transferred between your computer and the internet/another device
   • broadband
     • high speed connection to the internet
   • wireless connections
     • computer networks that are not connected by any kind of cables
       • increased efficiency
       • connection speeds are slower
       • less secure than wired
         • can be interfered with through walls, etc
       • can be expensive to set up
       • cheap as there are not cables
       • can link devices and businesses
       • can access it anywhere
   • data buffer
     • physical place where data is temporarily stored between transfers, usually while you're watching something

4. network media

   • copper cables
     • distances only up to 100m
     • transmission speeds of 1GB/s
       • average broadband speeds
     • cheaper than fibre optic
     • a lot of interference
     • quality is not 100%
   • fibre optic cables
     • long distance
     • breakage is unikely
     • transfers data at the speed of light
     • data is safe
     • almost no interference due to lack of friction