Computer networks, by Ana Bugallo and Julia Martínez


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Project about computer technology for the bilingual section of Technology at IES Praia Barraña school in Boiro, Spain.

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Computer networks, by Ana Bugallo and Julia Martínez

  1. 1. Julia Martínez Tomé & Ana Bugallo.3º ESO- A.
  2. 2.  1. What’s a computer network? 2. Categories of computer networks:2.1. Local area networks or LANs.2.2. Metropolitan area networks or MANs.2.3. Wide area networks or WANs. 3. Fundamental elements 4. Internet access
  3. 3.  A computer network is a set of computersconnected to each other so they can shareresources and exchange information.
  4. 4.  We can divide the computer networks in threetypes:1. Local area networks or LANs.2. Metropolitan area networks or MANs, madeup of several LANS.3. Wide area networks or WANs, covering acountry or continent.
  5. 5.  The LANs arecomputernetworks thatinterconnectcomputers in alimited area such as ahome, school, computer laboratory oroffice building, usingnetwork media.
  6. 6.  Differents types of LANs:
  7. 7.  A MAN is a computer network that usually spans a cityor a large campus. A MAN usually interconnects anumber of LANs using a high-capacity backbonetechnology, such as fiber-optical links, and providesup-link services to WAN and the Internet.
  8. 8.  A WAN is a network that covers a broadarea (i.e. any telecommunicationsnetwork that links acrossmetropolitan, regional or nationalboundaries) using private orpublic network transports. They are also call Wireless LANs.
  9. 9.  They use electromagnetic waves to transmitdata. Networks with a combination of wired andwireless devices use wireless access points orWAP that can transmit data through wires orelectromagnetic waves.
  10. 10.  An adaptor (orNetwork Card network card) tosend and receiveinformationto and fromother computers.
  11. 11.  The hub distributes all Hubof the information itreceives among theother computers in thenetwork.
  12. 12.  A cable similar to a RJ45 connectortelephone wire withan RJ45 connector atthe end whichlets theinformation passthrough it.
  13. 13.  We can use coaxial and opticalfiber cables for this function.Optical fiber cable Coaxial cable
  14. 14.  We can connect to the Internet in twodifferent ways.What are they?
  15. 15.  Using Internet ConnectionSharing (ICS), in which onecomputer is switchedon all the time so that allthe communication can gothrough it.
  16. 16.  Using a router, adevice which detectsdata and directs it toand from the Internet.
  17. 17.  But network sharing has got onedisadvantage.What could it be?
  18. 18.  In order for theother users Us to be able to access theInternet,the computer withall the sharedelements must beswitched on at alltimes.
  19. 19. How canwe overcome thisproblem?
  20. 20.  We can usenetwork storagesystems andprint servers.
  21. 21. 