1.4 Networks

1.4 Networks

1. LAN

   • Covers a local area, small geographical area
   • 100-1000 Mbps, high speed
   • Its not expensive to set up
   • Example is Ethernet
   • More security than WAN, Can provide physical security for the entire LAN and all connected computers

2. WAN

   • Wide Area, large geographical area
   • Connected together using the internet
   • 150 Mbps, low speed
   • High expensive to set it up but WAN's using public networks are cheaper to set up
   • They're open to threat
   • Example of WAN is Internet

3. Data Protection Act - 8 principles - Rebust DPA Laws

4. Network

   • two or more devices connected for the purpose of sharing and communicating.
   • Advantages
     • We can back up files
     • We can share software
     • We can work together on projects.
     • We can share files, data and information
   • Disadvantages
     • The cost
     • Adding computers to your network reduces your security to your data
     • Will also cost for all the equipment

5. Ethernet

   • Advantages
     • High bandwidth
     • Cheap
     • Fairly robust
     • Can make the cable as long as you need
     • Standard cable type
   • Disadvantages
     • Suffers signal degradation on long lengths of cable.
   • Types of ethernet cable.
     • Cat 6 (the fastest)
     • Cat 5e
     • Cat 5 (the slowest)

6. Keywords

   • Packet
   • Switch
   • Router
   • LAN
   • Wireless Access Point (WAP)
   • Transmission media
   • Network Performance
   • Network Interface Card (NIC)
   • DNS
     • Domain Name Servers
   • VPN
     • Virtual Private Network
       • it provides privacy, freedom and security

7. Packets

   • We use packets to break files up
   • They contain the address of the receiver and the sender
   • They also contain sequence number
   • They are given a time to live
   • When arrived at the receiver, it gets put back in order

8. Bandwidth

   • Its the amount of data transmitted.
   • The greater the bandwidth, the more you can do at once.

9. The difference between the world wide web and the internet is that the internet is all the hardware and the components

10. MAC address never changes.

    • IP address changes to stop users from getting hacked

11. Networking is connecting devices together to share data.

12. Other keywords with meanings.

    • url
      • unique resource location
    • http
      • hyper text transfer protocol
    • ftp
      • file transfer protocol
    • www
      • world wide web

13. IP address

    • static IP address
      • printers, routers and servers
    • They change every day for security
    • any device that has an internet connection has an IP address

14. Protocols are a set of rules we need to follow

15. Webpages are made up of html