2. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORKING Network Hardware Start …

3. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com BY THE END OF THIS SESSION … Identify the hardware needed to connect to a network Describe the purpose of different network devices Explain how data is passed between network devices Next … ALL : MOST : SOME :

4. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com Click to explore more about Network Hardware

5. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK HUB … The simplest way to connect more than one computer together is with a hub Each computer is connected to a port on the hub Next …

6. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK HUB … When the computers are connected they can share data and files Pear iHub ABDC Explore …

7. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK SWITCH … The problem with using cables to connect computers together is that only one data packet can be in the cable at any time If only one packet is been sent along the cable then there is no problem … Next … Hi there … Hey, how are you?

8. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK SWITCH … If two or more computers need to send a packet at the same time a data collision will occur Next … This is known as a data collision If two or more packets are sent at the same time, then we can have a problem …

9. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK SWITCH … Normally the network protocol deals with this It decides the collided data packets are unsuitable It forces the devices to resend their messages Next …

10. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK SWITCH … On a small network this isn’t a problem You wouldn’t notice the small delay caused by a data collision Next …

11. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK SWITCH … But imagine your school network with hundreds of computers, laptops and tablets There could potentially be thousands of data collisions each second Next …

12. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK SWITCH … On a large network a Network Switch helps deal with the problem of data collisions Pear iSwitch A B C D E F G Suppose Computer A needs to communicate with computer C … The switch makes the connection between ports A and C …Now suppose Computer A needs to communicate with computer E & G … The switch makes the necessary connections between the ports … Next …

13. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK SWITCH … The switch has a number of ports Computers or other devices can be connected to each port Next … A B C D E F G Pear iSwitch

14. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK SWITCH … The switch remembers the address for each device connected to each port Next … A B C D E F G 14C829 23D801 45G610 Pear iSwitch

15. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK SWITCH … When a packet comes into the switch, its destination address is read The switch makes a direct connection between the two devices A B C D E F G 14C829 45G610 From : 12C829 To : 45G110 From : 12C829 To : 45G110 Explore … Pear iSwitch

16. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK ROUTER … A Router is a network device that transfers data from one network to another Its job is to direct and transfer data packets to their destination through the most efficient route Next …

17. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK ROUTER … You are probably familiar with the router you have at home This type of router directs traffic from your home network to the Internet Next …

18. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK ROUTER … The router contains a small micro-computer The microcomputer stores a list of all the networks it is connected to It also stores how busy each network path is Next …

19. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK ROUTER … All this information is stored in the Routing Table DestinationRoutePort 125.0.0.0137.14.2.51 137.0.1.1121.0.12.54 161.5.0.0164.17.3.42 210.3.4.0167.17.0.016 Port 1 Port 2 The Internet Port 16 Router Wireless Access Point Port 3 Next …

20. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK ROUTER … To do this the router performs the following tasks: Reads the destination address for the data packet Looks up the paths available to get to the address Checks to see how busy each path is Chooses the most efficient (fastest) path Explore …

21. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK REPEATER … All signals get weaker the further they travel A voice gets quieter the further away you are The light from a torch gets weaker the further away you are Next …

22. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK REPEATER … All types of network cable have a maximum transmission length If you go beyond that length the signal becomes too weak to be useable Clean Signal Weak & Distorted Signal 200 meters Next …

23. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK REPEATER … Repeaters are used to split the connections up into sections Each section is less than the maximum useable distance Explore … Clean Signal Repeater

24. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK BRIDGE … A network bridge is used to join two separate networks Once bridged, the two networks become one extended network Next … Network A Bridge

25. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK BRIDGE … In a way, a Bridge works in a similar way as a Router But it can only pass packets between the two joined networks Explore …

26. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK CARD … The Network Card allows a device to physically connect to a network Most modern computers have a built in network card or wireless adaptor Older desk top computers had a separate network card Next …

27. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK CARD … The network card normally has two small LEDs next to the network socket The green LED flickers on and off as data is transmitted from the device to the network The orange LED lights up if there is no network connection – even if a cable is connected Next …

28. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com NETWORK CARD … It is not just computers that use a network card Printers, network hard drives and even TVs can use network cards Explore …

29. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com WIRELESS ACCESS POINT … Early networks had to be hard-wired Each device needed a physical wire in order for it to be connected to the network Modern devices can be connected to a network via a Wi-Fi connection Next …

30. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com WIRELESS ACCESS POINT … A wireless enabled device will search for a Wireless Access Point to connect to Next …

31. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com WIRELESS ACCESS POINT … Security on wireless networks is important Data packets need to be encrypted and an access key (or password) should be used on the access point Explore … 

32. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com MODEM … Your laptop or desktop computer at home needs to use your telephone line to connect to the Internet The problem is computers use digital signals and the telephone signal uses analogue signals Computer Digital Signal Telephone Analogue Signal Next …

33. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com MODEM … To allow your computer to send a message down the telephone line its digital signal needs to be converted to an analogue signal A Modem is a device that can convert this digital signal to an analogue signal This is known as Modulation Next …

34. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com MODEM … Computer Digital Signal Telephone Analogue Signal Next …

35. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com MODEM … The modem can also take an analogue signal and change it into a digital signal for your computer to understand This is known as Demodulation Next …

36. Copyright ©it’sLearning 365. All rights reserved. www.itslearning365.com MODEM … A modem is able to Modulate and Demodulate a signal Hence the name - MODEM Explore …