Computer Network for 3 ESO Technologies


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This unit is used in a 3 ESO group in a Highschool from Torrijos. These students are 14 years old

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Computer Network for 3 ESO Technologies

  1. 1. Networks 6.1. Network Basics 1.1 Definition 1.2 Classification 1.3 Elements 6.2 Internet. Home services 6.3 Network protocol Inidicadores Definir el concepto de red informática y distinguir sus elementos básicos y los tipos de redes Conocer los principales tipos de conexiones existente, así como el concepto de ancho de banda Comprender los conceptos de protocolo de comunicación, dirección de red y nombres de dominio
  2. 2. 6.1.1 Definition <ul><li>A computer network is a connection between several computers in order to be able to share resources, files, etc. </li></ul>
  3. 3. 6.1.1 Definition <ul><li>Thanks to networks we can use the same printers, projectors, scanners or even files that are connected to a different computer </li></ul>
  4. 4. 6.1.2 Classification <ul><li>We can identify each type of net according to its coverage and distance between users </li></ul>
  5. 5. 6.1.2 Classification <ul><li>LAN or Local Area Network, includes several computers connected by switch in the same building. You could find it in any office like the Administration office of your school. </li></ul>
  6. 6. 6.1.2 Classification <ul><li>MAN or Metropolitan Area Network is the connections of several LAN situated for example in different buildings from a same company. </li></ul>For example an University and its faculties are connected forming a MAN
  7. 7. 6.1.2 Classification <ul><li>WAN or Wide Area Network is the connections computer around the world, that’s Internet . </li></ul>When we visit a webpage like Tuenti, we are connecting our pc with the server of Tuenti
  8. 8. 6.1.3 Elements <ul><li>Server </li></ul>Users Connector /wireless Switch Let’s see the main elements in a network Modem
  9. 9. 6.1.3 Elements <ul><li>Connectors : We need something to send the information, we can use cables, mobile phone or wireless waves. </li></ul>Wireless : It reach only close users non more than 30m . Wired : It need a physical connection but it gives high connection flow
  10. 10. 6.1.3 Elements We need and element to connect all pc together a switch or a router
  11. 11. 6.1.3 Elements Router : connects all computers together, both wireless or wired 4 pc Switch : connects several, 12 or 24 computers together with wires Router and switch
  12. 12. 6.2 Internet. Home services <ul><li>Internet provider and modem : we can be connected to a network, but we need a adaptor to get connected to the Internet provider . This transmitter is called modem . There are several types </li></ul>
  13. 13. 6.2 Internet. Home services <ul><li>All these elements are used to connect our pc with the Internet Servers </li></ul>Mobile Modem: mobile phone companies can give us internet connections Telephone wire Modem: We use the telephone wire to connect our modem Cable Modem: We use the cable to connect our modem.
  14. 14. 6.2 Internet. Home services <ul><li>We can use the telephone wire and a modem to connect to Internet providers like jazztell,, telefónica, etc. We can't get big bandwidth. </li></ul>Telephone wire Modem: We use the telephone wire to connect our modem
  15. 15. 6.2 Internet. Home services <ul><li>In big cities first and nowadays not so big, we can get connected to the optical fiber . This cable get us really a big bandwith. These internet providers are ONO, R, etc… </li></ul>
  16. 16. 6.2 Internet. Home services <ul><li>Nowdays we can connect our computers everywhere using mobile modems . These are more expensive and give low bandwidth. These internet providers are Movistar, Vodafone, Yoigo, Orange, etc </li></ul>Mobile Modem: mobile phone companies can give us internet connections
  17. 17. 6.2 Internet. Home services <ul><li>What is bandwidth???? </li></ul><ul><li>It’s the available data communication resources expressed in bits/second or multiples of it (kilobits/s, megabits/s etc. </li></ul><ul><li>Nowadays we get from 0,5Mb to 20 Mb </li></ul>0,5 Mb 5 Mb 20 Mb
  18. 18. 6.2 Internet. Home services <ul><li>There are several bandwidth meters online, where you can evaluate your internet connection. </li></ul>
  19. 19. 6.2 Internet. Home services If someone is downloading big files at high speed you will have less bandwidth, it’s like having a leak in a pipe
  20. 20. 6.3 Network protocol <ul><li>As do with mobile phones, computers need a number to identify each pc that is surfing on the net </li></ul> This number is the IP. All computers working in a network get a local IP number by the switch and a another IP for Internet
  21. 21. 6.3 Network protocol <ul><li>When we say that we are connected to Internet , we are getting in contact with different computers named Server </li></ul>IP: IP: IP:
  22. 22. 6.3 Network protocol <ul><li>So, when we write the computer calls, and we enter in their computer </li></ul>IP:
  23. 23. 6.3 Network protocol <ul><li>If we write, instead of we get there too¡¡¡¡ </li></ul>
  24. 24. 6.3 Network protocol <ul><li>All computers have a IP in internet, but servers have a public IP so everyone can see what is inside </li></ul>privet IP privet IP Public IP Public IP Router Public IP Router Public IP
  25. 25. 6.3 Network protocol <ul><li>Users have privet IP so anyone can get in us. Although our modem provides a temporal public IP </li></ul>
  26. 26. 6.3 Network protocol <ul><li>Check this out¡¡¡ In both networks pc and routers have the same IP???? </li></ul>Each network is independent, but when we connect to Internet we get a public IP different than the rest
  27. 27. 6.2 Internet. Home services <ul><li>Some bandwidth meters online, gives us our external IP too </li></ul>
  28. 28. 6.3 Network protocol <ul><li>If you want to know your IP in your network, you have to go to run ipconfig on your terminal. </li></ul>
  29. 29. 6.3 Network protocol <ul><li>If you want run ipconfig , you have to go to Start, Run , type CMD , and then type ipconfig and press enter </li></ul>