Computer Science Revision

Computer Science Revision

1. Networks

   • LAN = Local area network
   • WAN = Wide area network
   • Bus
     • A single cable
     • Cheap to install
     • If breaks it takes out entire network
     • High chance of collisions
     • Can corrupt each other
     • Multiple communications
   • Ring
     • Connected in a ring
     • In one direction
     • Cheap to install
     • No collisions
     • If one cable breaks, network fails
     • Difficult to expand
   • Star
     • Single central switch
     • Fast
     • Low chance of collision
     • Low chance of failure
     • Expensive
     • Depends on a switch
   • Group of computers that are connected

2. Computational Thinking

3. Spreadsheets

4. Cybersecurity