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1st Session

Caroline De Cock & Peter Van Roste

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Putting thingsin perspective:

what will happenon the Internet

during the nexthour?

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13 billionemails

The amount of emailssent per hour

2100hoursThe amount of YouTubeVideos uploaded every hour

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How is this possible?

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#1. Something started 42 years agofor military & academic purposes

was opened to commercial companies

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#2. And thetechnology to

make it work wasmade open

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Sowhats

the

Internet7

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The Internet is a bunchof computers and

cables linked to eachother and that can

communicate acrossthe globe

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The Internet is the worldwide, publicly accessiblenetwork of interconnected computer networksthat transmit data by using thestandard Internet (IP). It is a "network

of networks" that consists of millions of smallerdomestic, 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

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All of this translates into a multitude of players

Source: OECD, The economic and social role of Internet intermediaries, April 2010

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*Plain Old Telephony Services

From POTS* to the Net

Traditional telephony is based oncircuit switching, which implies:

Communication flow followsa path that is selectedbeforehand and that remainsfixed during the session

This path is dedicated

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So this is what a circuit switched networklooks like

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Packet switchingThe Internet is based on packetswitching, which implies:

The sending computer slices datainto small packets, with an addresson each to tell the network whereto send them

These packets are sent as need be

and in what looks like a chaoticflow

At the end, the receiving computerputs the puzzle back together

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But whatsin a packet?

FooterBody/DataHeader

1000 to 1500 bytes

- Sender &ReceiverIP address- Protocol- Packet n

- Data (e.g. Thecontent of an email)

-Data to

show endof packet- Errorcorrection

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So this is what a packet switched networklooks like

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Application Layer

And to make all of this work, you need acommon language: PROTOCOLS

Transport Layer

Network Layer

Data / Link Layer

Physical Layer

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And to function, these protocols needto go through ports

File transfer Email Web browsing VoIP

FTP SMTP HTTP SIP

Ports20 or 21

Port25

Port80

Transport Layer

Port5060

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...OK but what happens between this

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...and that?

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#1. Find server

#2. Process query

#3. Assembly

#4. Return to PC

62.25.101.80

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Disclaimer

Source: http://909sickle.com/s/geeks-and-nerds/22

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Disclaimer (contd)

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