1.4 Wired and Wireless Networks

1.4 Wired and Wireless Networks

1. CLIENT SERVER

   • receives and processes requests from clients
     • what user does on computer is sent to central computer
       • workers can update central databases
         • server stores users account details
           • easier to implement security precedures

2. PEER-PEER

   • all computers have equal status
     • no dependance on server
       • no need for network manager
         • all users have to log in the same computer
           • relatively easy to maintain
             • allow individual devices to share files between each other

3. WAN

   • telecommunication company provides infrastructure
     • larger geographical area

4. LAN

   • own infrastructure
     • telecommunication owned by organization
       • Local Area Network
         • HARDWARE
           • wireless access parts
             • routers/switches
               • NIC
                 • transmission media
                   • Modem

5. DNS SERVER

   • Domain Name System
     • has list of all domain names and IP addresses
       • hosting

6. CLOUD COMPUTING

   • load files from any location and any device
     • data automatically backed up
       • no upfront cost
         • servers run applications

7. VIRTUAL NETWORK

   • part of a LAN/WAN
     • configured so that certain devices can see each other

8. VPN

   • Virtual Private Network
     • send data securely over a WAN

9. PACKETS

   • Packet number
     • Sender and receivers IP address
       • internet protocol
         • set of rules that govern how devices communicate

10. CABLES

    • FIBRE OPTIC
      • doesn't suffer from electrical interference
        • transmit data through light
    • COPPER
      • electric conductor
      • disadvantages
        • corrosion
        • shorter lifespan

11. WHAT AFFECTS PERFORMANCE OF NETWORK?

    • cable
      • bandwidth - amount of data that can be transmitted in a certain amount of time
        • router (transfers data between two networks)
          • distance - weaker signal if far