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[Applause]
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[Applause]
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[Music]
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[Music]
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for the first time in history people and
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machinery are working together realizing
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a dream a uniting force that knows no
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geographical boundaries without regard
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to race creed or color a new era where
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communication truly brings people
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together this is the dawn of the net
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want to know how it works click here to
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begin your journey into the net now
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exactly what happened when you clicked
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on that link you started a flow of
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information this information travels
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down into your own personal mail room
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where mr. IP packages it labels it and
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sends it on its way each packet is
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limited in its size the mail room must
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decide how to divide the information and
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how to package it now the package needs
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a label containing important information
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such as senders address receivers
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address and the type of packet it is
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[Music]
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because this particular packet is going
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out onto the Internet it also gets an
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address for the proxy server which has a
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special function as we'll see later the
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packet is now launched on to your local
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area network or LAN this network is used
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to connect all the local computers
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routers printers etc for information
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exchange within the physical walls of
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the building the land is a pretty
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uncontrolled place and unfortunately
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accidents can happen
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[Music]
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the highway of the land is packed with
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all types of information
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these are IP packets Novell packets
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appletalk packets they're going against
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traffic as usual the local router reads
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the address and if necessary lifts the
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packet onto another network ah the
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router a symbol of control in a
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seemingly disorganized world there he is
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systematic uncaring methodical
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conservative and sometimes not quite of
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disputed but at least he is exact for
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the most part
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as the packets leave the router they
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make their way into the corporate
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intranet and head for the router switch
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a bit more efficient than the router the
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router switch plays fast and loose with
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IP packets deftly routing them along the
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way
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a digital pinball wizard if you will as
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packets arrive at their destination
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they're picked up by the network
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interface ready to be sent to the next
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level in this case the proxy the proxy
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is used by many companies as sort of a
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middleman in order to lessen the load on
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the internet connection and for security
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reasons as well as you can see the
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packets are all of various sizes
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depending upon their content
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[Music]
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the proxy opens the packet and looks for
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the web address or URL depending upon
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whether the address is acceptable the
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packet is sent on to the Internet there
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are however some addresses which do not
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meet with the approval of the proxy that
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is to say corporate or management
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guidelines
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these are Samara lis dealt with we'll
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have none of that for those who make it
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it's on the road again
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[Music]
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next up the firewall
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[Music]
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the corporate firewall serves two
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purposes it prevents some rather nasty
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things from the internet from coming
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into the intranet and it can also
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prevent sensitive corporate information
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from being sent out on to the Internet
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once through the firewall a router picks
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up the packet and places it on to a much
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narrower road or bandwidth as we say
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obviously the road is not broad enough
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to take them all now you might wonder
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what happens to all those packets which
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don't make it along the way well when
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mr. IP doesn't receive an acknowledgment
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that a packet has been received in due
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time he simply sends a replacement
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packet we are now ready to enter the
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world of the internet a spider web of
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interconnected networks which span our
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entire globe here routers and switches
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establish links between networks now the
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net is an entirely different environment
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than you'll find within the protected
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walls of your land out here fits the
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Wild West plenty of space plenty of
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opportunities plenty of things to
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explore and places to go thanks to very
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little control and regulation new ideas
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find fertile soil to push the envelope
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of their possibilities but because of
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this freedom certain dangers also lurk
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you'll never know when you'll meet the
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dreaded pain of death a special version
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of a normal request pain which some
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idiot thought up to mess up unsuspecting
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hosts
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the pass our packets take maybe via
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satellite telephone lines wireless or
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even transoceanic cable they don't
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always take the fastest or shortest
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routes possible but they will get there
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eventually maybe that's why it's
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sometimes called the world wide wait but
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when everything is working smoothly you
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can circumvent the globe five times over
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at the drop of a hat
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literally and offer the cost of a local
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call or less near the end of our
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destination we'll find another firewall
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depending upon your perspective as a
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data packet the firewall could be a
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bastion of security or a dreaded
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adversary it all depends on which side
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you're on
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and what your intentions are the
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firewall is designed to let in only
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those packets that meet its criteria
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this fire was operating on ports 80 and
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25 all attempts to enter through other
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ports are closed for business
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[Music]
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port 25 is used for mail packets while
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port 80 is the entrance for packets from
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the Internet to the web server inside
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the firewall packets are screened more
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thoroughly some packets make it easily
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through customs while others look just a
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bit dubious the firewall officer is not
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easily fooled
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such as when this ping of death packets
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it tries to disguise itself as a normal
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ping packet for those packets lucky
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enough to make it this far
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the journey is almost over it's just a
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line up on the interface to be taken up
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into the web server nowadays a web
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server can run on many things from a
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mainframe to a webcam to the computer on
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your desk why not your refrigerator with
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a proper setup you can find out if you
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have the makings for Chicken Cacciatore
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or if you have to go shopping
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remember this is the dawn of the net
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almost anything is possible
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one by one the packets are received
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opened and unpacked the information they
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contain that is your request for
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information is sent on to the web server
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application the packet itself is
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recycled ready to be used again and
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filled with your requested information
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addressed and sent out on its way back
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to you back past the firewall routers
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and on through to the internet back
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through your corporate firewall and on
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to your interface ready to supply your
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web browser with the information you
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requested that is this film
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[Music]
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pleased with their efforts and trusting
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in a better world our trusty data
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packets ride off blissfully into the
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sunset of another day knowing fully they
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have served their masters well knives of
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that a happy ending
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[Music]
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[Music]
