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<ul><li>What is Computer Network?–  network can consist of either two computers connected together or it can consist of ma...
<ul><li>Basic data communication system: </li></ul><ul><li>1. Source-  this is a transmitter data. The example of source: ...
<ul><li>LAN  – it’s a high-speed data network that covers usually small area. It connects personal computers, workstations...
 
<ul><li>A Metropolitan Area Network (MAN) -  is a large computer network that spans a metropolitan area or campus. Its geo...
 
<ul><li>WAN  - are a communication system linking LANs between cities, countries and continents.  </li></ul><ul><li>This i...
 
<ul><li>Due to increased use of people in using network facility, the “social network” became very popular. These sites of...
<ul><li>Again with increased modernisation and use of the network it all led to increased speed of the internet. New clien...
<ul><li>What is Webinar? – In other words its a web based seminar. </li></ul><ul><li>Instead of meeting in a conference ro...
<ul><li>Podcasts is another way to share information, what you  have to do is go through a subscription feed such as  RSS(...
<ul><li>http://russbellew.com/images/computernetwork_iStock_000004660040XSmall-2.jpg </li></ul><ul><li>http://ops.fhwa.dot...
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Using computer networks as facility to share information

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Using computer networks as facility to share information

  1. 2. <ul><li>What is Computer Network?– network can consist of either two computers connected together or it can consist of many Local Area Networks (LAN) connected together to form a Wide Area Network (WAN) (these terms are going to be explained later in next slides) </li></ul><ul><li>What is data communication- is a transfer of information/data between a source and a reciever. </li></ul><ul><li>How data is transfered? – Local Area Networks, MANs, WANs used to connect computer together to share resources </li></ul><ul><li>In simple language by hooking the cable between 2 computers we can have data communication. And the factors like distance, protocol, signalling and security will determine how data communication will take place. </li></ul>
  2. 3. <ul><li>Basic data communication system: </li></ul><ul><li>1. Source- this is a transmitter data. The example of source: Terminal, Computer, Mainframe </li></ul><ul><li>2. Medium -this is a communication stream through which the data is transmitted. Examples are: Cabling, Radio Frequencies, Infrared Wireless, Microwave, Fiber Optics. </li></ul><ul><li>3. Destination -this is reciever of data transmited which can consist of Printer, Terminal, Mainframe, Computer </li></ul>
  3. 4. <ul><li>LAN – it’s a high-speed data network that covers usually small area. It connects personal computers, workstations, servers, printers and other different devices. So LAN gives an opportunity to users for file exchange e.g (peer-to-peer programs), webinars, electronic mail and other kinds of applications/programs. </li></ul><ul><li>All of the devices attached to the LAN share a single communications medium, usually a coaxial, twisted-pair, or fiber-optic cable. </li></ul><ul><li>A physical connection can be made by putting a network interface card (NIC) inside the computer and connecting it to the network cable. Once the physical connection is in place, then the network software manages communications between stations on the network. </li></ul><ul><li>To send and receive information to and from computer the network software puts the message information in a packet. </li></ul><ul><li>The big drawback of LAN is that this system can only be couple of kilometers </li></ul>
  4. 6. <ul><li>A Metropolitan Area Network (MAN) - is a large computer network that spans a metropolitan area or campus. Its geographic scope falls between a WAN and LAN. MANs provide Internet connectivity for LANs in a metropolitan region, and connect them to wider area networks like the Internet </li></ul><ul><li>A MAN is made from switches or routers connected to one another with high-speed links (usually fibre optic cables). </li></ul><ul><li>Metropolitan Area Networks (MANs) are networks that connect LANs together within a city. </li></ul>
  5. 8. <ul><li>WAN - are a communication system linking LANs between cities, countries and continents. </li></ul><ul><li>This is network which covers a large geographical area, and use communications circuits to connect the intermediate nodes. </li></ul><ul><li>In other words this is in contrast to both the local area network and the metropolitan area network, which provides communication within a restricted geographic area. </li></ul>
  6. 10. <ul><li>Due to increased use of people in using network facility, the “social network” became very popular. These sites offer people easily to create their own online pages or profiles or to construct the online network of contacts(friends). The users can simply communicate through the profile that they have created both with their friends and with people outside their list of contacts(friends). </li></ul><ul><li>The most popular sites are FaceBook, MySpace, Bebo and many others </li></ul><ul><li>Due to increased connection speed it enabled richer use of the internet for users so now new social sites have the ability to support high quality images, audio and video content. </li></ul>
  7. 11. <ul><li>Again with increased modernisation and use of the network it all led to increased speed of the internet. New clients were created like IRC, LimeWire, Utorrent, BitTorrent and so on, they are also called peer-to-peer programs. </li></ul><ul><li>These program model allows any two users to share files with each other without having to run their own server computer, with the advantage that peer-to-peer sharing can take place over the Internet rather than just the local network. </li></ul><ul><li>Like client-server file sharing, the end user doesn't have to consciously set permissions on the files being shared, because the peer-to-peer software handles the security mechanisms. </li></ul>
  8. 12. <ul><li>What is Webinar? – In other words its a web based seminar. </li></ul><ul><li>Instead of meeting in a conference room people can meet in a virtual conference room on the web. Joining a meeting does not take long – you have to follow the instructions, which you will receive shortly after you have registered. Instead of meeting in a conference room you will be able to meet in a virtual conference room on the web. Joining a meeting does not take long </li></ul><ul><li>Again this is another example of sharing information with the help of computer networks. </li></ul>
  9. 13. <ul><li>Podcasts is another way to share information, what you have to do is go through a subscription feed such as RSS(Rich Site Summary) which can be played then on iPods or MP3 player. Users also have the ability to listen topodcasts through their computers. </li></ul><ul><li>You can publish your own audio/video files through internet so then users can subscribe via an RSS feed and then can automatically receive new files. </li></ul><ul><li>But with the rapid growth of the internet more people now beginning to send video rather then audio and its all because of broadband connection became more available. </li></ul>
  10. 14. <ul><li>http://russbellew.com/images/computernetwork_iStock_000004660040XSmall-2.jpg </li></ul><ul><li>http://ops.fhwa.dot.gov/publications/telecomm_handbook/images/fig2-15.gif </li></ul><ul><li>http://www.tele-strategy.com/clientlogo/479a3979d66a4wide_area_network.gif </li></ul><ul><li>http://www.freebookcentre.net/Networking/Free-Computer-Networking-Books-Download.html </li></ul><ul><li>http://www.cisco.com/en/US/docs/internetworking/technology/handbook/Intro-to-LAN.html#wp1020555 </li></ul><ul><li>http://www.cadvision.com/blanchas/Intro2dcRev2/pagetoc.html#toc </li></ul><ul><li>http://jcmc.indiana.edu/vol13/issue1/boyd.ellison.html </li></ul><ul><li>http://www.scribd.com/doc/4105302/Social-Networking-Research-on-Behaviour-Ofcom </li></ul><ul><li>http://www.dhigroup.com/Software/Webinar/WhatIsAWebinar.aspx </li></ul><ul><li>http://www.pulsewan.com/whatis_datacomm.htm </li></ul>

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