Unit 1 And 2 Revision

Unit 1 And 2 Revision

1. Networks

   • LAN
     • Connects over a small geographical area
   • WAN
     • Connects over a large area nework
   • WPAN
     • Connects over your own personal network

2. Connection types

   • Router
     • The heart of the network
   • WIFI
     • Used to access the internet
   • Ethernet
     • A family of computer networking technologies

3. Computer hardware

   • RAM
     • A storage device that information can store and retrieve
   • CPU
     • Processes instructions into the computer
   • Virtual memory
     • Used when RAM is full of storage
   • Secondary Storage
     • Solid State
       • Most durable but expensive
     • Magnetic
       • Primarily hard disk
     • Optical
       • Uses a laser to retrieve data packs

4. Network threats

   • Viruses
     • Programmed to harm your computer
   • Spyware
     • Unwanted data in the computer system
   • Adware
     • Used to form a malware to protect malicious software from entering

5. Network hardware

   • Known as network equipment or computer networking devices are electronic devices which are required for communication
   • GATEWAY
     • ROUTER
       • SWITCHES
     • NETWORK BRIDGES
       • NETWORKING CABLES
         • LINE DRIVERS
     • MODEMS
       • WIRELESS ACTION POINTS
       • HUBS