Paper 1

Paper 1

1. Devices

   • Input devices
     • keyboard
     • mouse
     • sensors
   • output devices
     • printer
     • moniter
     • plotter
     • lights

2. Systems Architecture

   • CPU
     • executes programs using fetch decode execute
     • core
       • processing unit
       • contains ALU, CU and registers
       • more cores = faster processing
     • clock speed
       • how fast CPU can run in MHz or GHz
       • how many instruction cycles per second
   • memory
     • cache
       • small amount of memory closer to CPU than RAM
     • RAM
       • volatile
         • stores data only when power is supplied
       • stores data while program is being executed
     • ROM
       • non volatile
       • contains start up program
   • storage
     • stores programs and files long term

3. Storage

4. Wired and Wireless Networks

5. Network Topologies

6. Ethical, Legal and Environmental

   • Data Protection Act
     • set of rules controlling:
       • who can access data
       • accuracy and validity of data
       • selling data
       • removal of data
     • controls data shared online
   • IP adresses
     • tracks all users' online acticity
       • can be masked using proxy server
         • criminals to spread viruses
         • businesses to mask company network
   • Computer Misuse Act
     • offence to:
       • access data without permission
       • access data with intent to commit criminal offence
       • alter data without permission
   • digital divide
     • between areas with access to technology and those without
     • causes
       • money
       • location
       • IT literacy
       • internet access
   • Environment
     • advantages
       • less printed paper
       • less need for travel
       • less need for commuting
     • disadvantages
       • consumes energy
       • waste - throw away old phone