revision

revision

1. networks

   • LAN
     • devices connected over a small geographical area
       • local area network
   • WAN
     • networks connected over a large geographical area

2. network hardware

   • ethernet cable
     • a cable that connects you to a LAN
   • router
     • allows you to share resources such as your internet connection , printers and files across different devices
   • switch
     • so that all of the devices can connects to a central point on a local area metwork
   • wireless access point (wifi extender)
     • wireless access points used to improve the signal in places where the router can't reach
   • server
     • a really powerful computer that controls the network . Websites and cloud storage is stored on a web server . your computer connects to this using a wide area network
   • modem
     • used to connect to a wide area network such as the internet.

3. network threats and security

   • fire wall
     • controls which programs can send or recive data packets from your computer or network
     • stops intruders from accessing your computer system, only trusted programs should be aloud to send or recive data packets
   • antivirus
     • scans your computer periodically for malware and quarantines it so it doesn't spread to other files
   • passwords
     • need to be at least 8 characters long should include UPPERCASE , lower case , numbers and symbols
     • stops unauthorised users from accessing your account / profile
   • phishing
     • attempting to steal personal information by sending an email pretending to be a genuine website / company
     • email will ask you to click a link an fill in personal details

4. computer hardware

   • RAM