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INTERNET




Prepared by : Nuwan Darshana
              Sri Lanka
              nuwaned@gmail.com
INTERNET


What is the INTERNET ?
The Internet is a global system of interconnected
computer network.

It is a network of networks that consists of millions of
private and public, academic, business, and government
networks of local to global scope that are linked by copper
wires, fiber-optic cables, wireless connections, and other
technologies.
What is the INTERNET ?



Technically, the "internet" is all the computers in the world that are
connected, including the technologies (routers, servers, etc (which are also
computers actually) as well as the wires and antennas that keep all the
computers talking to each other.

So the "internet" is not just your web email. It is everything that goes over
those wires from one computer to another: the email itself, web sites,
messenger (such as Yahoo Messenger or MSN Messenger), phone calls
on Skype, messages from an ATM to a bank, ...

The words "Internet" and "Web" are often used interchangeably. Strictly
speaking, the "Internet" would be everything that goes between computers,
and the "Web" would be ... websites.
Importance of the internet to you.




Because of all these things, the "internet" is a
gigantic library, as well as a world-wide message
board, telephone network, and publishing medium. It
is open 24 hours a day, and you can find anything
you want there, and say anything you want.
Importance of the internet to our organization

•"Communication"
with other organizations, with your members, with your staff, with your supporters and
donors.
     some great ways: letters, phone calls, faxes, meetings

    additional ways: email, messenger, web pages, mail lists, web site message boards



•"Publishing" your message to the world.

    some great ways: books, journals, brochures, press releases, workshops,
    conferences, lectures.

    additional ways: website with conference proceedings, PDF files of your
    publications, blogs, newsfeeds
•Customer support"

the people you are helping through your organization.
     Nothing is better than people with people: interviews, workshops, conferences,
     classes.

    additional ways can help them when you aren't there: email, messenger, web
    pages, mail lists, web site message boards. With video-conferencing, podcasting
    and other great web tools, you can even have workshops and classes online.

•"Research"
on the news, issues, papers and literature relevant to your cause.
     some great ways: books, magazines, journals, papers
•Increase credibility
•increase exposure
•Greater quantity and quality of inquiries.
•Increase donations and sales
•Reduce cost per contact
•Increased access to your information
•Save on printing costs
• Reduce phone usage and staff load.
•educe postage, express mail and courier service, and
phone costs.
•increase your "green rating".
What are the Risks?
Here are some of the major risks you and your family
face when using the Internet:


   Viewing objectionable material
   Meeting someone online
   Losing privacy
   Losing time
   Finding false information
History of Internet

               ARPANET
The ARPANET (Advanced Research Projects
Agency Network) created by ARPA of the United
States Department of Defense during the Cold
War, was the world's first operational packet
switching network, and the predecessor of the
global Internet.

    ARPANET Started In Late – 1970
ARPANET Logical Map
Timothy Berners-Lee
(Tim Berners-Lee)



Born           - 8 June 1955 ) (age 54)
                 London, England
Other names    - Tim
Education      - The Queen's College, Oxford
Occupation     - Computer Scientist
Employer         - World Wide Web Consortium
and University of Southampton
Known for      - Inventing the World Wide Web
Title          - Professor
Network


1. LAN – Local Area Network


1. MAN – Metropolitan Area Network


2. WAN – Wide Area Network
Network




LAN – Local Area Network
Network




MAN – Metropolitan Area Network
Network




WAN – Wide Area Network
INTERNET




Connecting through        Connecting through


      Cable                     Satellite
Internet Submarine Cable




   Repeaters
Internet Submarine Cable Map
SEA - ME – WE             Cable System




     Cable Path          - Singapore to France
     Cable Length        - 13 500 km
     Connected Countries - 7
     Launched on         - 08th September 1986
South - East Asia - Middle East - Western Europe
                 Cable System
Internet Submarine Cable
Internet Satellite System
How computers are connected to the internet
What Are The Different Methods Of Connecting To
            The Internet?


There are numerous ways to connect to the Internet. Here
are the more obvious ones:

Direct connection, by using a computer that is permanently plugged into the
Internet.

By phone line. This may be by dial-up or ADSL, but still uses a phone line.

By cable. This facility is provided by a cable-TV supplier.

In a wireless hotspot.

By satellite. It is possible to have two-way satellite Internet communications
nowadays, but it is quite expensive.
How to get connected to the Internet ?




Computer
Modem
Phone Line
Internet Service Provider (ISP)
Internet Map
Internet Servers
Modem


Modem (from modulator-demodulator) is a device
that modulates an analog carrier signal to encode
digital information, and also demodulates such a
carrier signal to decode the transmitted
information.



     Modulator Demodulator - MODEM
Internet Modem




External Modem
Internet Modem




Internal Modem
Internet Modem




Wireless Modem (USB Modem )
Web Browsers


What is a Web Browser ?


A web browser is a software application that
retrieves and collects information resources
and arranges and displays the Internet
resources on the computer screen.
The major web browsers
    Windows Internet Explorer



    Mozilla Firefox



    Apple Safari



    Google Chrome



    Opera.
Internet Explorer interface   Mozilla Firefox interface




Apple Safari interface        Google Chrome interface
Web Search Engine


What is a Web Search Engine ?


A Web search engine is a tool designed to
search for information on the World Wide
Web.
Search Engine LOGOs
Search Engine




                Search Engine
Search Engine




                Search Engine
Web Page & Web Site



                 Connecting
                 to other
                 pages
Content of Web Page
                                    Web Hyperlinks




Web Browser                                      Picture
                                                 Hyperlinks



Web Address
  (URL)
Hyperlinks and Web pages
Web Address


         http://www.


http - Hypertext Transfer Protocol
www - World Wide Web
Tips for Parents


Keep the computer in a shared room so you can see what
the child is doing online.

Ensure children are not using mobiles devices in their
rooms when they should be sleeping.

Ensure that your child knows the dangers of giving out
personal information over the web and never does this.

Talk to your kids, make sure they know the risks, get
involved with your child's life online, learn with your child.
Tips for Parents


Set rules about time online (recommended max 2 hours*
screen time per day, including TV)

Let your children know that not everything they read online is
true. That goes for people in chat rooms and virtual worlds too,
as people are not always who they say they are.

Don't allow them to share personal pictures of themselves or
others with strangers. Make sure that older children think
about the consequences of their online actions and their online
reputation.
THANK YOU

Prepared by : Nuwan Darshana
             Sri Lanka
             nuwaned@gmail.com

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Internet

  • 1. INTERNET Prepared by : Nuwan Darshana Sri Lanka nuwaned@gmail.com
  • 2. INTERNET What is the INTERNET ? The Internet is a global system of interconnected computer network. It is a network of networks that consists of millions of private and public, academic, business, and government networks of local to global scope that are linked by copper wires, fiber-optic cables, wireless connections, and other technologies.
  • 3. What is the INTERNET ? Technically, the "internet" is all the computers in the world that are connected, including the technologies (routers, servers, etc (which are also computers actually) as well as the wires and antennas that keep all the computers talking to each other. So the "internet" is not just your web email. It is everything that goes over those wires from one computer to another: the email itself, web sites, messenger (such as Yahoo Messenger or MSN Messenger), phone calls on Skype, messages from an ATM to a bank, ... The words "Internet" and "Web" are often used interchangeably. Strictly speaking, the "Internet" would be everything that goes between computers, and the "Web" would be ... websites.
  • 4. Importance of the internet to you. Because of all these things, the "internet" is a gigantic library, as well as a world-wide message board, telephone network, and publishing medium. It is open 24 hours a day, and you can find anything you want there, and say anything you want.
  • 5. Importance of the internet to our organization •"Communication" with other organizations, with your members, with your staff, with your supporters and donors. some great ways: letters, phone calls, faxes, meetings additional ways: email, messenger, web pages, mail lists, web site message boards •"Publishing" your message to the world. some great ways: books, journals, brochures, press releases, workshops, conferences, lectures. additional ways: website with conference proceedings, PDF files of your publications, blogs, newsfeeds
  • 6. •Customer support" the people you are helping through your organization. Nothing is better than people with people: interviews, workshops, conferences, classes. additional ways can help them when you aren't there: email, messenger, web pages, mail lists, web site message boards. With video-conferencing, podcasting and other great web tools, you can even have workshops and classes online. •"Research" on the news, issues, papers and literature relevant to your cause. some great ways: books, magazines, journals, papers
  • 7. •Increase credibility •increase exposure •Greater quantity and quality of inquiries. •Increase donations and sales •Reduce cost per contact •Increased access to your information •Save on printing costs • Reduce phone usage and staff load. •educe postage, express mail and courier service, and phone costs. •increase your "green rating".
  • 8. What are the Risks? Here are some of the major risks you and your family face when using the Internet:  Viewing objectionable material  Meeting someone online  Losing privacy  Losing time  Finding false information
  • 9. History of Internet ARPANET The ARPANET (Advanced Research Projects Agency Network) created by ARPA of the United States Department of Defense during the Cold War, was the world's first operational packet switching network, and the predecessor of the global Internet. ARPANET Started In Late – 1970
  • 11. Timothy Berners-Lee (Tim Berners-Lee) Born - 8 June 1955 ) (age 54) London, England Other names - Tim Education - The Queen's College, Oxford Occupation - Computer Scientist Employer - World Wide Web Consortium and University of Southampton Known for - Inventing the World Wide Web Title - Professor
  • 12. Network 1. LAN – Local Area Network 1. MAN – Metropolitan Area Network 2. WAN – Wide Area Network
  • 13. Network LAN – Local Area Network
  • 15. Network WAN – Wide Area Network
  • 16. INTERNET Connecting through Connecting through Cable Satellite
  • 19. SEA - ME – WE Cable System Cable Path - Singapore to France Cable Length - 13 500 km Connected Countries - 7 Launched on - 08th September 1986 South - East Asia - Middle East - Western Europe Cable System
  • 22. How computers are connected to the internet
  • 23. What Are The Different Methods Of Connecting To The Internet? There are numerous ways to connect to the Internet. Here are the more obvious ones: Direct connection, by using a computer that is permanently plugged into the Internet. By phone line. This may be by dial-up or ADSL, but still uses a phone line. By cable. This facility is provided by a cable-TV supplier. In a wireless hotspot. By satellite. It is possible to have two-way satellite Internet communications nowadays, but it is quite expensive.
  • 24. How to get connected to the Internet ? Computer Modem Phone Line Internet Service Provider (ISP)
  • 27. Modem Modem (from modulator-demodulator) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. Modulator Demodulator - MODEM
  • 31. Web Browsers What is a Web Browser ? A web browser is a software application that retrieves and collects information resources and arranges and displays the Internet resources on the computer screen.
  • 32. The major web browsers  Windows Internet Explorer  Mozilla Firefox  Apple Safari  Google Chrome  Opera.
  • 33. Internet Explorer interface Mozilla Firefox interface Apple Safari interface Google Chrome interface
  • 34. Web Search Engine What is a Web Search Engine ? A Web search engine is a tool designed to search for information on the World Wide Web.
  • 36. Search Engine Search Engine
  • 37. Search Engine Search Engine
  • 38. Web Page & Web Site Connecting to other pages
  • 39. Content of Web Page Web Hyperlinks Web Browser Picture Hyperlinks Web Address (URL)
  • 41. Web Address http://www. http - Hypertext Transfer Protocol www - World Wide Web
  • 42. Tips for Parents Keep the computer in a shared room so you can see what the child is doing online. Ensure children are not using mobiles devices in their rooms when they should be sleeping. Ensure that your child knows the dangers of giving out personal information over the web and never does this. Talk to your kids, make sure they know the risks, get involved with your child's life online, learn with your child.
  • 43. Tips for Parents Set rules about time online (recommended max 2 hours* screen time per day, including TV) Let your children know that not everything they read online is true. That goes for people in chat rooms and virtual worlds too, as people are not always who they say they are. Don't allow them to share personal pictures of themselves or others with strangers. Make sure that older children think about the consequences of their online actions and their online reputation.
  • 44. THANK YOU Prepared by : Nuwan Darshana Sri Lanka nuwaned@gmail.com