1. Computer Networks

2. By the end of this class, you should be able to: Understand the models of computer networks identify some network hardware devices and cables and describe their roles on the computer network Differentiate between the different network topologies Understand what a bandwidth is.

3. Computer network Operating systems Peer to peer Client Server

4. Computer Networks (Area) LAN WAN

6. Ethernet: is a LAN

8. LAN Cabling Coaxial cables CAT 5, CAT 6 Fiber Optics

9. Coaxial cables

10. CAT 5, CAT 6

11. Fiber Optics

13. FIBER OPTIC CABLE ADVANTAGES OVER COPPER: SPEED: Fiber optic networks operate at high speeds - up into the gigabits BANDWIDTH: large carrying capacity DISTANCE: Signals can be transmitted further without needing to be "refreshed" or strengthened. RESISTANCE: Greater resistance to electromagnetic noise such as radios, motors or other nearby cables. MAINTENANCE: Fiber optic cables costs much less to maintain.

14. Some network Devices Modem: Modulation/ demodulation Bridge: to connect LANs Hub/Switch: to connect computers Gateway: to connect LAN to WAN Router: to forward packets of information over the network, intelligent routers will pick the routes with less traffic so that packets will arrive faster.

15. What does a MODEM do?

17. Switch Ethernet Switch

19. LAN can be connected to another LAN through a “BRIDGE”

21. LAN can be connected to WAN through a “Gateway”

22. Network Topologies

23. Other types of computer networks Intranet Extranet VPN Activity: Find out the difference between Intranet and Extranet

24. What is a bandwidth? It’s the overall capacity of the connection. The greater the capacity, the more likely that better performance will result. Bandwidth is the amount of data that passes through a network connection over time as measured in bps. (bits per second). Activity: Find out how to improve the performance of a computer network.

25. Sources http://compnetworking.about.com/od/basicnetworkingconcepts/l/blbasics _networ.htm http://compnetworking.about.com/od/basicnetworkingconcepts/l/blbasics _networ.htm www.gizmodo.com.au http://www.tech-faq.com/storage-area-network.shtml http://www.supretech.com/Supretech_sample_Wan_Diagram.jpg http://images.google.com/imgres?imgurl=http://static.howstuffworks.com/ gif/ethernet3.gif&imgrefurl=http://computer.howstuffworks.com/ethernet.h tm/printable&usg=__srQvmjtUS4KbXazvIjOh4WgWeGA=&h=342&w=39 6&sz=18&hl=en&start=1&tbnid=sdtdjBS3CDvx2M:&tbnh=107&tbnw=124 &prev=/images%3Fq%3Dethernet%26gbv%3D2%26hl%3Den http://images.google.com/imgres?imgurl=http://static.howstuffworks.com/ gif/ethernet3.gif&imgrefurl=http://computer.howstuffworks.com/ethernet.h tm/printable&usg=__srQvmjtUS4KbXazvIjOh4WgWeGA=&h=342&w=39 6&sz=18&hl=en&start=1&tbnid=sdtdjBS3CDvx2M:&tbnh=107&tbnw=124 &prev=/images%3Fq%3Dethernet%26gbv%3D2%26hl%3Den http://images.google.com/imgres?imgurl=http://www.gyre.co.uk/images/b roadband_router_1.png&imgrefurl=http://www.gyre.co.uk/help/broadband /connection_sharing.php&usg=__-MVAm3- HlR1uL5pa_RfvsOuIVE0=&h=430&w=448&sz=24&hl=en&start=15&tbni d=ScXI0bVwkISl4M:&tbnh=122&tbnw=127&prev=/images%3Fq%3Drout er%26gbv%3D2%26hl%3Den http://images.google.com/imgres?imgurl=http://www.gyre.co.uk/images/b roadband_router_1.png&imgrefurl=http://www.gyre.co.uk/help/broadband /connection_sharing.php&usg=__-MVAm3- HlR1uL5pa_RfvsOuIVE0=&h=430&w=448&sz=24&hl=en&start=15&tbni d=ScXI0bVwkISl4M:&tbnh=122&tbnw=127&prev=/images%3Fq%3Drout er%26gbv%3D2%26hl%3Den http://www.arcelect.com/fibercable.htm