Networks

Networks

1. LAN

   • Ususally confined wiht a local geographic area.
   • Found in schools,colleges and businesses
   • Workstations wiht network cards or wirelss connectivity
   • Connected via own cables
   • Often have shared peripherals e.g. printers.
   • Allows for print sharing

2. WAN's

   • Wide area networks
   • Computers are not close together
   • Extrenal communications equiptments are needed e. g. phone line.
   • A router or physical device is needed.

3. VLAN's

   • Allows computers to communicate with each other as if a single LAN.
   • A virtual network so computers communicate with each other.
   • A virtual network can also exist in more than one local area netwrork

4. Intranet

   • Provides the same services as internet but only within organisation
   • Secure
     • Need a Username and Password
   • Used for:
     • Internal e-mail
     • Internal web page
     • Internal chat
     • File transfer

5. Internet

   • An infrastructure provided to connect computers together across the globe
     • E.g. Telecoms, telephone lines and leased lines.

6. Extranet

   • Access to internet via username and password
   • Has access to intranet services of the organisation
   • Users can access from any connected computer
   • Confidentiality maintained and able to contact and communicate with people in the organisation

7. Peer to Peer

   • Each computer performs its own function
   • Needs to have permision from other computers.
   • All peers no leader
   • Easy to set up

8. Servers

   • Print
   • File
   • Proxy
   • Security
   • Applications
   • All ran together off one main computer

9. Client- Server

   • Client computers are all connected by a switch or network communication
   • To print etc need to log onto a computer
   • To access use card or fingerprint Allows the user to:
     • User has private amount of dedicated space
     • Printers
     • Files with permision
     • Software used within the organisation

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