Unit 1 and 2 Computing Revision

Unit 1 and 2 Computing Revision

1. Networks

   • LAN
     • Local Area Network.
     • A LAN is when devices are connected over a small geographical area.
       • Examples could be a school or a home.
     • You can connect to a LAN using Wifi or Ethernet.
   • WAN
     • Wide Area Network.
     • WANs connect using a modem.
     • A WAN is when networks are connected over a large geographical area
       • An example could be the internet
   • WPAN
     • Wireless Personal Area Network.
     • A WPAN allows us to pair devices together over a short range.
       • Examples could be a speaker connected to a phone or a smartwatch connected to a smartphone
     • You can connect to a WPAN by using bluetooth

2. Connection types

   • Wifi
     • Disadvantages
       • Limited range (unless you use a wifi extender). Can be hacked by unauthorised users.
     • Advantage
       • Good for connecting portables devices to a LAN.
   • Ethernet
     • Disadvantage
       • Cables are more expensive than wifi connection.
     • Advantage
       • Faster data transfer speed compared to wifi. Has a range of 100 metres.
   • GPRS
     • Disadvantage
       • Mobile data can be expensive - requires a SIM card. Limited/slow connection speed in some locations.
     • Advantage
       • Can be used on the move. Good for mobile devices such as smartphones.
   • Bluetooth
     • Disadvantage
       • It can be hacked by unauthorised users. The range is quite short
     • Advantage
       • Up to 7 bluetooth devices can be paired at once

3. Network threats and security

   • Firewall
   • Antivirus
   • Passwords
   • Phishing
   • Encryption