garfield hs ap cs 2009 - intarwebs

Teh Intarw3bsOr becoming better informed users of the Internet

Networks

• 146 BC - Greeks use torch signals

• 1830s - Electric telegraph

• 1870s - Telephone

• 1920s - AM radio

• 1930s - Television

• 1960s - FM radio

• 1970s - Computer networks

The Internet?

• A network of networks

• Companies, schools have their own networks

• E-mail, the World Wide Web, FTP are ways of sending info over the Internet

Why the Internet?

• Military: ARPANET 1969

• First version of “today’s Internet” in 1983

How does it work?

How does it work?

• I figure out what information I want and where it is

How does it work?


• I make a request to the server

How does it work?



• The server sends back my info

How does it work?



• The server sends back my info

• (A server is any computer that can send out data in response to a request)

HTML?

• Hypertext Markup Language

• Defines the structure of a web page

<h1>This is a heading</h1><h2>A sub-heading</h2><p>This is a paragraph!</p>

Blue Scholars on MySpace

www.myspace.com

http://www.myspace.com


Blue Scholars on MySpaceLet’s check out the Blue Scholars’ MySpace page

www.myspace.com




www.myspace.com

Give me the Blue Scholars’ page!




www.myspace.com


Ok here it goes:



www.myspace.com


Ok here it goes:<html xmlns:myspace="http://x.myspacecdn.com/modules/sitesearch/static/rdf/profileschema.rdf#"><head><meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" /><script type="text/javascript"> //<![CDATA[var MySpace = {};var MySpaceRes = {};MySpaceRes.Common = {"Yes":"Yes","No":"No","Ok":"Ok","Attention":"Attention"};MySpaceRes.Header = {"Cancel":"Cancel / Cancelación","Continue":"Continue / Continuar"};MySpace.ClientContext = {"UserId":-1,"DisplayFriendId":1450027,"IsLoggedIn":false,"FunctionalContext":"UserViewProfile","UserType":1};

MySpace.StaticContentBase='http://x.myspacecdn.com'; MySpace.ClientMaintenanceConfigs = {"asyncphotobrowsecaching":0,"msplinksconvertall":0,"photocommentsajax":0,"inf_ind_newvideocomment":0,"musicjv_amazoninplace":0,"enablevideocategorydropdown":0,"applications_userapppreferences":0,"inf_ind_unreadim":0,"webimtestclient":0,"applications_showafterloaduhp":0,"applications_showafterloadprofiles":0,"applications_enablev2settingspopup":0,"musicjv_allmyplaylists":0,"inf_ind_newclassified":0,"webimcoldfusion":0,"webimclientrichtexteditor":0,"mdpcontaineruseopencanvas":0,"inf_ind_newautotag":0,"applications_enableopenidpopuphandling":0,"applications_removeonappprofile":0,"friendselectorinstatusmooddialog":0,"musicjv_debug":0,"photoquickpostmessaging":0,"mdp_enable_homeappnavdragdrop":0,"musicjv_stoprefresh_medrec":0,"mystuffautos":0,"mystuffreportabusepost":0,"dwbeaconmusicsearch":0,"dashboard_songstats":0,"dashboard_corestats":0,"dashboard_trends":0,"dashboard_artistrank":0,"dashboard_agegender":0,"dashboard_visitorsfriends":0,"dashboard_map":0,"dashboard_blogstats":0,"mystuffuploadphotos":0,"dwbeaconclientv2":0,"dashboard_monetization":0,"dwbeaconphotoprint":0,"mdpactivitiesautopublish":0,"dwbeaconpymk":0};MySpace.ClientIntMaintenanceConfigs = {};//]]></script><title> Blue Scholars on MySpace Music - Free Streaming MP3s, Pictures & Music Downloads</title><meta name="keywords" content="friends networking sharing photos finding friends blogs journals blogging journaling bands music rate pics join groups forums classifieds online social networking" /><meta property="myspace:profileType" content="Music" about="Blue Scholars" typeof="myspace:MusicProfile" ><meta name="description" content="MySpace Music profile for Blue Scholars. Download Blue Scholars Hip Hop / House / Tropical music singles, watch music videos, listen to free streaming mp3s, & read Blue Scholars's blog." /><meta http-equiv="expires" content="0" /><meta http-equiv="Pragma" content="no-cache" /><script type="text/javascript" src="http://js.myspacecdn.com/modules/common/static/js/swfobject-15_pba8crsx.js"></script>

<script type="text/javascript">MySpace.Ads = {};MySpace.Ads.Account = {"Type":"7"};MySpace.Ads.BandType = {"Genre1":"21","Genre2":"22","Genre3":"92","LabelType":""};MySpace.Header = {}; MySpace.Header.IsTrueGlobalHeaderEnabled = false; MySpace.Header.Navigation = {};MySpace.Header.Navigation.OnAfterRender = function(){};

</script><script type="text/javascript" src="http://js.myspacecdn.com/modules/common/static/js/myspace_gocrglkv.js"></script><script type="text/javascript" src="http://cms.myspacecdn.com/cms/js/ad_wrapper0143.js"></script>

<script type="text/javascript">MySpace.ProfileClientContext = {"ProfileType":7,"ProfileVersion":1,"PrivateToUser":false};

</script>

<link rel="canonical" href="http://www.myspace.com/bluescholars" /><link rel="stylesheet" type="text/css" href="http://x.myspacecdn.com/modules/common/static/css/myspace_jVtNwmP4.css" />

<link rel="stylesheet" type="text/css" href="http://x.myspacecdn.com/modules/common/static/css/global_hu7nbz0y.css" /><link rel="stylesheet" type="text/css" href="http://x.myspacecdn.com/modules/profiles/static/css/profilelegacy_odkpcpi9.css" /><link rel="openid2.provider" type="application/x-openid-kvf" href="http://api.myspace.com/openid" /><link rel="stylesheet" type="text/css" href="http://x.myspacecdn.com/modules/profiles/static/css/musicv2_wo4zzzd-.css" />

<style type="text/css">



http://x.myspacecdn.com/modules/sitesearch/static/rdf/profileschema.rdf#




http://x.myspacecdn.com


www.myspace.com






</script>













www.myspace.com






</script>




Cool, thanks!










www.myspace.com






</script>












www.myspace.com

<html xmlns:myspace="http://x.myspacecdn.com/modules/sitesearch/static/rdf/profileschema.rdf#"><head><meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" /><script type="text/javascript"> //<![CDATA[var MySpace = {};var MySpaceRes = {};MySpaceRes.Common = {"Yes":"Yes","No":"No","Ok":"Ok","Attention":"Attention"};MySpaceRes.Header = {"Cancel":"Cancel / Cancelación","Continue":"Continue / Continuar"};MySpace.ClientContext = {"UserId":-1,"DisplayFriendId":1450027,"IsLoggedIn":false,"FunctionalContext":"UserViewProfile","UserType":1};





</script>


www.myspace.com



Where’s MySpace?!

IP addresses

• Every computer on the Internet has a unique address (ex.: 74.125.67.100)

• Domain Name Servers (DNS) map names to addresses

You: 67.171.16.158

DNS server: 208.67.222.222

IP addresses



You: 67.171.16.158

Where’s myspace.com?

DNS server: 208.67.222.222

IP addresses



You: 67.171.16.158


216.178.38.116DNS server: 208.67.222.222

IP addresses



You: 67.171.16.158


216.178.38.116

myspace.com: 216.178.38.116

DNS server: 208.67.222.222

IP addresses



You: 67.171.16.158


216.178.38.116

myspace.com: 216.178.38.116

Where’s www.myspace.com

DNS server: 208.67.222.222













IP addresses



You: 67.171.16.158


216.178.38.116

myspace.com: 216.178.38.116

Where’s www.myspace.com63.135.89.46

DNS server: 208.67.222.222













IP addresses



You: 67.171.16.158


216.178.38.116

myspace.com: 216.178.38.116


www.myspace.com: 63.135.89.46

63.135.89.46

DNS server: 208.67.222.222















IP addresses



You: 67.171.16.158


216.178.38.116

myspace.com: 216.178.38.116



63.135.89.46

DNS server: 208.67.222.222Give me the Blue Scholars page















IP addresses



You: 67.171.16.158


216.178.38.116

myspace.com: 216.178.38.116



63.135.89.46

DNS server: 208.67.222.222Give me the Blue Scholars page

Ok, here it goes!












Searching

A bunch of links and words

• “Crawlers” or “spiders” look at pages

• Extract all words and links

• Stores them in a table, much like the index of a book

• When you make a query, it’s looked up in the table

Page Ranking

• A page is important if a lot of important pages link to it

• Entire Internet gets to “vote”

garfield hs ap cs 2009 - intarwebs

Education