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Nerds in the EP - What's the Internet
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Nerds in the EP - What's the Internet

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Presentation made in the European Parliament on 23 May 2011 to explain in a simple way some basics of the Internet.

Presentation made in the European Parliament on 23 May 2011 to explain in a simple way some basics of the Internet.

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Transcript

  • 1. 1st SessionCaroline De Cock & Peter Van Roste 1
  • 2. Putting thingsin perspective:what will happen on the Internet during the next hour? 2
  • 3. 13 billionemailsThe amount of emailssent per hour 2100 hours The amount of YouTube Videos uploaded every hour 3
  • 4. How is this possible? 4
  • 5. #1. Something started 42 years ago for military & academic purposeswas opened to commercial companies 5
  • 6. #2. And the technology tomake it work was made open 6
  • 7. So what’s theInternet 7
  • 8. The Internet is a bunch of computers and cables linked to each other and that can communicate across the globe 8
  • 9. The Internet is the worldwide, publicly accessiblenetwork of interconnected computer networksthat transmit data by using thestandard Internet (IP). It is a "networkof networks" that consists of millions of smaller “domestic, academic, business, and governmentnetworks, which together carry variousinformation and services, such as electronic mail,online chat, file transfer, and the interlinked Webpages and other documents of 9
  • 10. 10
  • 11. All of this translates into a multitude of players Source: OECD, The economic and social role of 11 Internet intermediaries, April 2010
  • 12. From POTS* to the NetTraditional telephony is based oncircuit switching, which implies:• Communication flow follows a path that is selected beforehand and that remains fixed during the session• This path is dedicated *Plain Old Telephony Services 12
  • 13. So this is what a circuit switched network looks like 13
  • 14. Packet switchingThe Internet is based on packetswitching, which implies:• The sending computer slices data into small packets, with an address on each to tell the network where to send them• These packets are sent as need be and in what looks like a chaotic flow• At the end, the receiving computer puts the puzzle back together 14
  • 15. 1000 to 1500 bits Header Body/Data Footer But what’s - Sender & Receiver - Data (e.g. The content of an email) -Data to show end IP address of packetin a packet? - Protocol - Packet n° - Error correction 15
  • 16. So this is what a packet switched network looks like 16
  • 17. And to make all of this work, you need a common language: PROTOCOLSApplication LayerTransport Layer Network LayerData / Link Layer Physical Layer 17
  • 18. And to function, these protocols need to go through ports File transfer Email Web browsing VoIP FTP SMTP HTTP SIP Ports Port Ports Port20 or 21 25 25 or 80 5060 Transport Layer 18
  • 19. ...OK but what happens between this 19
  • 20. ...and that? 20
  • 21. #1. Find server 62.25.101.80 #2. Process query #3. Assembly#4. Return to PC 21
  • 22. Disclaimer 22 Source: http://909sickle.com/s/geeks-and-nerds/
  • 23. Disclaimer (cont’d) 23