Unit 1 and 2 revision

Unit 1 and 2 revision

1. Networks

   • Lan
     • stands for Local area network.
     • When devices are connected over a small geographical area.
     • You can connect to a lan using wifi or ethenet
   • Wan
     • Stands for Wide area network.
     • when networks connect over a large geographical area.
     • you can connect to a wan through telephone connection or gprs
   • Wpan
     • Stands wireless personal area network
     • a wpan allows us to pair devices over a short range

2. Connection types

   • wifi
     • wifi is good for connecting portable devices to a lan
   • ethernet
     • it has faster transfer speeds then wifi and has a range of up to 100 meters
   • Gprs
     • it can be used on the move and good for mobile devices
   • Bluetooth
     • up to 7 devices can be paired at once

3. network threats and security

   • Firewall
     • A firewall controls which programs can send or receive data packets from your computer networks and stops unauthorised users from accessing your computer
   • Anti malware
     • Anti malware scans your computer periodically for malware and quarantines malware so that it doesn't spread to other files or computers
   • Passwords