1. Network Recap

2. First a recap on networks What is a stand alone PC What is a LAN Name 5 advantages of a LAN What is a WAN Name 1 advantage and 1 disadvantage with a WAN

3. Star Networks How good is a star network?

4. What type of network is this and how good is it?

5. What is this network and how does it work?

6. Communications Mr Hewitt

7. Network Components How would you connect a stand alone PC to the Internet? THE INTERNET Modems: To access the internet, (a WAN) a modem is needed A modem or modulator demodulator converts the computers digital signals into the analogue (voice signals) of phone lines More modern lines (broadband) carry digital signals so rather than a modem you would use a terminal adapter

8. Network Components How would you connect a LAN to the Internet or make a LAN into a WAN? The internet or another LAN Gateway: A gateway is used to translate data between one network and another.

9. The Importance of Bandwidth Computers connected to the internet have different transmission speeds (measured in Kbps or now Mbps) The faster the transmission speed, the more data can be transferred. Transmission speed is called ‘bandwidth’ If a network does not have enough bandwidth, it will be slow!

10. Low Bandwidth Network with low bandwidth As the amount of data travelling between computers increases, the network gets slower and slower!

11. High Bandwidth Network with high bandwidth This network has enough bandwidth to cope with all of the data travelling across it!

12. How to get more bandwidth You can get more bandwidth than you can from a standard 56K modem? Get an ISDN or ADSL line and subscribe to broadband These newer lines are not analogue but digital – this means they are much faster You need a special broadband modem which is actually called a terminal adaptor But –typically this is more expensive